/* ============================================
   CSS Custom Properties (Design Tokens)
   ============================================ */
:root {
    /* Colors */
    --color-purple: #7C3AED;
    --color-blue: #3B82F6;
    --color-cyan: #06B6D4;
    --color-electric-blue: #0EA5E9;
    --color-accent-purple: #A855F7;
    --color-dark-bg: #0F172A;
    --color-dark-secondary: #1E293B;
    --color-dark-card: #1E293B;
    --color-light-bg: #F8FAFC;
    --color-light-secondary: #F1F5F9;
    --color-white: #FFFFFF;
    --color-gray: #64748B;
    --color-gray-light: #CBD5E1;
    --color-gray-dark: #334155;
    --color-text-dark: #1E293B;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--color-purple), var(--color-blue), var(--color-cyan));
    --gradient-secondary: linear-gradient(135deg, var(--color-blue), var(--color-electric-blue));
    --gradient-accent: linear-gradient(135deg, var(--color-accent-purple), var(--color-purple));
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    /* Typography */
    --font-system: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 4rem;
    
    /* Borders */
    --border-radius-sm: 0.5rem;
    --border-radius-md: 0.75rem;
    --border-radius-lg: 1rem;
    --border-radius-xl: 1.5rem;
    --border-radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 30px rgba(124, 58, 237, 0.3);
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
}

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

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

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

a {
    text-decoration: none;
    color: inherit;
    transition: all var(--transition-base);
}

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

ul {
    list-style: none;
}

/* ============================================
   Container & Layout
   ============================================ */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

section {
    padding: var(--spacing-3xl) 0;
    position: relative;
}

/* ============================================
   Background Shapes (Parallax Elements)
   ============================================ */
.bg-shapes {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
    overflow: hidden;
}

.shape {
    position: absolute;
    border-radius: 50%;
    background: var(--gradient-primary);
    opacity: 0.15;
    filter: blur(100px);
    animation: float 20s ease-in-out infinite;
}

.shape-1 {
    width: 500px;
    height: 500px;
    top: -100px;
    right: -100px;
    animation-delay: 0s;
}

.shape-2 {
    width: 400px;
    height: 400px;
    bottom: -150px;
    left: -100px;
    animation-delay: -7s;
}

.shape-3 {
    width: 350px;
    height: 350px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: -14s;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    33% {
        transform: translate(30px, -30px) scale(1.1);
    }
    66% {
        transform: translate(-20px, 20px) scale(0.9);
    }
}

/* ============================================
   Header / Navigation
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(124, 58, 237, 0.1);
    z-index: 1000;
    padding: var(--spacing-md) 0;
    transition: all var(--transition-base);
}

.header.scrolled {
    box-shadow: 0 2px 20px rgba(124, 58, 237, 0.1);
}

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

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

.brand-name {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin: 0;
    line-height: 1;
}

.brand-tagline {
    font-size: var(--font-size-sm);
    color: var(--color-gray);
    margin-top: 2px;
}

.nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-link {
    color: var(--color-gray-dark);
    font-weight: 500;
    font-size: var(--font-size-base);
    transition: all var(--transition-base);
}

.nav-link:hover {
    color: var(--color-purple);
}

.btn-small {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-sm);
}

/* Mobile menu toggle (hidden by default) */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-gray-dark);
    transition: all var(--transition-base);
}

/* ============================================
   Typography
   ============================================ */
.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradient-shift 5s ease infinite;
    background-size: 200% 200%;
}

@keyframes gradient-shift {
    0%, 100% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
}

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

.section-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-gray);
    max-width: 600px;
    margin: 0 auto;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius-md);
    font-weight: 600;
    font-size: var(--font-size-base);
    cursor: pointer;
    transition: all var(--transition-base);
    border: 2px solid transparent;
    position: relative;
}

.btn-primary {
    background: var(--color-purple);
    color: var(--color-white);
    box-shadow: 0 2px 8px rgba(124, 58, 237, 0.25);
}

.btn-primary:hover {
    background: #6D28D9;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(124, 58, 237, 0.3);
}

.btn-secondary {
    background: var(--color-white);
    color: var(--color-purple);
    border: 2px solid var(--color-purple);
}

.btn-secondary:hover {
    background: var(--color-light-bg);
    transform: translateY(-1px);
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-lg);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    padding-top: calc(var(--spacing-3xl) + 60px);
    background: linear-gradient(180deg, var(--color-light-bg) 0%, var(--color-white) 100%);
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: rgba(124, 58, 237, 0.1);
    color: var(--color-purple);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--border-radius-full);
    border: 1px solid rgba(124, 58, 237, 0.3);
    font-size: var(--font-size-sm);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    animation: fade-up 0.8s ease-out;
}

.badge-icon {
    font-size: var(--font-size-base);
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.hero-content {
    z-index: 1;
}

.hero-title {
    font-size: var(--font-size-6xl);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--spacing-lg);
    animation: fade-up 0.8s ease-out;
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--color-gray-dark);
    margin-bottom: var(--spacing-xl);
    max-width: 500px;
    animation: fade-up 0.8s ease-out 0.2s backwards;
    line-height: 1.6;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    animation: fade-up 0.8s ease-out 0.4s backwards;
}

.hero-visual {
    position: relative;
    height: 500px;
    animation: fade-up 0.8s ease-out 0.6s backwards;
}

.floating-card {
    position: absolute;
    animation: float-gentle 4s ease-in-out infinite;
}

.card-1 {
    top: 20%;
    left: 10%;
    animation-delay: 0s;
}

.card-2 {
    bottom: 20%;
    right: 10%;
    animation-delay: -2s;
}

.chat-bubble {
    background: var(--color-white);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(124, 58, 237, 0.2);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-md) var(--spacing-lg);
    box-shadow: 0 10px 30px rgba(124, 58, 237, 0.15);
    max-width: 300px;
}

.chat-bubble p {
    margin: 0;
    font-size: var(--font-size-base);
    color: var(--color-text-dark);
}

.chat-icon {
    font-size: var(--font-size-2xl);
    margin-right: var(--spacing-xs);
}

.ai-response {
    background: linear-gradient(135deg, rgba(124, 58, 237, 0.1), rgba(59, 130, 246, 0.1));
    border: 1px solid rgba(124, 58, 237, 0.3);
}

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

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

/* ============================================
   Features Section
   ============================================ */
.features {
    background: var(--color-white);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-xl);
}

.feature-card {
    background: var(--color-white);
    backdrop-filter: blur(10px);
    border: 2px solid var(--color-light-secondary);
    border-radius: var(--border-radius-xl);
    padding: var(--spacing-xl);
    transition: all var(--transition-base);
    opacity: 0;
    transform: translateY(50px);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.feature-card.animate {
    opacity: 1;
    transform: translateY(0);
}

.feature-card:hover {
    transform: translateY(-10px);
    background: var(--color-white);
    border-color: var(--color-purple);
    box-shadow: 0 20px 40px rgba(124, 58, 237, 0.2);
}

.feature-icon {
    width: 64px;
    height: 64px;
    background: rgba(124, 58, 237, 0.1);
    border-radius: var(--border-radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-lg);
}

.feature-icon svg {
    width: 32px;
    height: 32px;
    color: var(--color-purple);
}

.feature-title {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.feature-description {
    color: var(--color-gray-dark);
    margin-bottom: var(--spacing-lg);
    line-height: 1.7;
}

.feature-list {
    list-style: none;
    padding: 0;
}

.feature-list li {
    padding: var(--spacing-xs) 0;
    color: var(--color-gray-dark);
    position: relative;
    padding-left: var(--spacing-lg);
}

.feature-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-cyan);
    font-weight: bold;
}

/* ============================================
   Video Section
   ============================================ */
.video-section {
    background: var(--color-light-bg);
}

.video-container {
    max-width: 900px;
    margin: 0 auto;
    opacity: 0;
    transform: scale(0.9);
}

.video-container.animate {
    opacity: 1;
    transform: scale(1);
    transition: all 0.6s ease-out;
}

.video-placeholder {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 aspect ratio */
    background: var(--color-white);
    backdrop-filter: blur(10px);
    border: 2px solid var(--color-light-secondary);
    border-radius: var(--border-radius-xl);
    overflow: hidden;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.video-placeholder:hover {
    border-color: var(--color-purple);
    box-shadow: 0 20px 40px rgba(124, 58, 237, 0.25);
}

.play-button {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80px;
    height: 80px;
    background: var(--color-purple);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-base);
    z-index: 2;
    box-shadow: 0 4px 20px rgba(124, 58, 237, 0.3);
}

.play-button:hover {
    transform: translate(-50%, -50%) scale(1.05);
    background: #6D28D9;
    box-shadow: 0 6px 24px rgba(124, 58, 237, 0.4);
}

.play-button svg {
    width: 32px;
    height: 32px;
    color: var(--color-white);
    margin-left: 4px;
}

.video-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(124, 58, 237, 0.1), rgba(6, 182, 212, 0.1));
}

.video-overlay p {
    font-size: var(--font-size-xl);
    color: var(--color-gray-dark);
    z-index: 1;
    font-weight: 500;
}

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

.steps-container {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.step {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-lg);
    opacity: 0;
    transform: translateX(-50px);
}

.step.animate {
    opacity: 1;
    transform: translateX(0);
    transition: all 0.6s ease-out;
}

.step-number {
    flex-shrink: 0;
    width: 60px;
    height: 60px;
    background: var(--color-purple);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-white);
}

.step-content {
    flex: 1;
    padding-top: var(--spacing-xs);
}

.step-title {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.step-description {
    color: var(--color-gray-dark);
    line-height: 1.7;
}

.step-connector {
    width: 2px;
    height: 40px;
    background: linear-gradient(180deg, var(--color-cyan), transparent);
    margin-left: 29px;
}

/* ============================================
   CTA Section
   ============================================ */
.cta-section {
    background: linear-gradient(135deg, #F8FAFC 0%, #EFF6FF 50%, #F5F3FF 100%);
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-primary);
    opacity: 0.05;
}

.cta-content {
    text-align: center;
    position: relative;
    z-index: 1;
    opacity: 0;
    transform: translateY(30px);
}

.cta-content.animate {
    opacity: 1;
    transform: translateY(0);
    transition: all 0.6s ease-out;
}

.cta-title {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.cta-subtitle {
    font-size: var(--font-size-xl);
    color: var(--color-gray-dark);
    margin-bottom: var(--spacing-xl);
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: var(--color-light-bg);
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
    border-top: 2px solid var(--color-light-secondary);
}

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

.footer-logo {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-xs);
}

.footer-tagline {
    color: var(--color-gray-dark);
    font-size: var(--font-size-sm);
}

.footer-column h4 {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.footer-column ul li {
    margin-bottom: var(--spacing-xs);
}

.footer-column a {
    color: var(--color-gray-dark);
    font-size: var(--font-size-sm);
}

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

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

.footer-bottom p {
    color: var(--color-gray);
    font-size: var(--font-size-sm);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1024px) {
    :root {
        --font-size-6xl: 3rem;
        --font-size-5xl: 2.5rem;
        --font-size-4xl: 2rem;
    }
    
    .hero .container {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }
    
    .hero-visual {
        height: 400px;
    }
    
    .footer-content {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --font-size-6xl: 2.5rem;
        --font-size-5xl: 2rem;
        --font-size-4xl: 1.75rem;
        --spacing-3xl: 4rem;
    }
    
    section {
        padding: var(--spacing-2xl) 0;
    }
    
    .header-content {
        justify-content: space-between;
    }
    
    .nav {
        display: none;
        /* Can be toggled with mobile menu */
    }
    
    .menu-toggle {
        display: flex;
    }
    
    .hero-title {
        font-size: var(--font-size-4xl);
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .hero-visual {
        height: 300px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .step {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    
    .step-connector {
        margin-left: 0;
    }
}

@media (max-width: 640px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .btn {
        width: 100%;
        text-align: center;
    }
    
    .hero-subtitle {
        font-size: var(--font-size-base);
    }
    
    .chat-bubble {
        padding: var(--spacing-sm);
        font-size: var(--font-size-sm);
    }
}

/* ============================================
   Animation Utilities
   ============================================ */
[data-animate] {
    opacity: 0;
}

[data-animate="fade-up"] {
    transform: translateY(50px);
}

[data-animate="slide-right"] {
    transform: translateX(-50px);
}

[data-animate="scale-up"] {
    transform: scale(0.9);
}

.animate {
    opacity: 1 !important;
    transform: translate(0) scale(1) !important;
}