/* ========================================
   ChatFlow Landing Page Styles
   A dark, modern design with vibrant accents
   ======================================== */

/* CSS Variables */
:root {
    /* Colors - Dark theme with WhatsApp-inspired green */
    --bg-primary: #0a0a0b;
    --bg-secondary: #111113;
    --bg-tertiary: #1a1a1d;
    --bg-card: #151517;
    
    --text-primary: #fafafa;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;
    
    --accent-primary: #25D366;
    --accent-secondary: #128C7E;
    --accent-glow: rgba(37, 211, 102, 0.3);
    
    --gradient-start: #25D366;
    --gradient-mid: #34D399;
    --gradient-end: #10B981;
    
    --border-color: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(255, 255, 255, 0.15);
    
    /* Typography */
    --font-primary: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    /* Spacing */
    --container-max: 1200px;
    --section-padding: 120px;
    --card-radius: 20px;
    --btn-radius: 12px;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

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

/* Container */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

/* ========================================
   Background Pattern & Orbs
   ======================================== */
.bg-pattern {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
    overflow: hidden;
}

.bg-pattern::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(circle at 1px 1px, rgba(255,255,255,0.03) 1px, transparent 0);
    background-size: 40px 40px;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.4;
    animation: float 20s ease-in-out infinite;
}

.orb-1 {
    width: 600px;
    height: 600px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    top: -200px;
    right: -200px;
    animation-delay: 0s;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    bottom: 20%;
    left: -150px;
    animation-delay: -7s;
}

.orb-3 {
    width: 300px;
    height: 300px;
    background: linear-gradient(135deg, var(--gradient-end), #06b6d4);
    bottom: -100px;
    right: 20%;
    animation-delay: -14s;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    33% {
        transform: translate(30px, -30px) scale(1.05);
    }
    66% {
        transform: translate(-20px, 20px) scale(0.95);
    }
}

/* ========================================
   Navigation
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 20px 0;
    transition: var(--transition-base);
}

.navbar.scrolled {
    background: rgba(10, 10, 11, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    padding: 12px 0;
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.25rem;
}

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

.logo-ai {
    color: var(--accent-primary);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-links a {
    font-size: 0.95rem;
    color: var(--text-secondary);
    transition: var(--transition-fast);
    position: relative;
}

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

.nav-links a:not(.btn)::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-primary);
    transition: var(--transition-fast);
}

.nav-links a:not(.btn):hover::after {
    width: 100%;
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition-fast);
}

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

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

.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Menu */
.mobile-menu {
    display: none;
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    background: rgba(10, 10, 11, 0.95);
    backdrop-filter: blur(20px);
    padding: 24px;
    flex-direction: column;
    gap: 20px;
    border-bottom: 1px solid var(--border-color);
    transform: translateY(-100%);
    opacity: 0;
    transition: var(--transition-base);
    z-index: 999;
}

.mobile-menu.active {
    transform: translateY(0);
    opacity: 1;
}

.mobile-menu a {
    font-size: 1.1rem;
    color: var(--text-secondary);
    padding: 8px 0;
}

/* ========================================
   Buttons
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--btn-radius);
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition-base);
    cursor: pointer;
    border: none;
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: #000;
    box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px var(--accent-glow);
}

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

.btn-outline:hover {
    border-color: var(--accent-primary);
    background: rgba(37, 211, 102, 0.1);
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
}

.btn-ghost:hover {
    color: var(--text-primary);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 24px 80px;
    max-width: var(--container-max);
    margin: 0 auto;
    gap: 60px;
}

.hero-content {
    flex: 1;
    max-width: 600px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: rgba(37, 211, 102, 0.1);
    border: 1px solid rgba(37, 211, 102, 0.2);
    border-radius: 100px;
    font-size: 0.85rem;
    color: var(--accent-primary);
    margin-bottom: 24px;
    animation: fadeInUp 0.6s ease forwards;
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--accent-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(2.5rem, 6vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 24px;
    animation: fadeInUp 0.6s ease 0.1s forwards;
    opacity: 0;
}

.gradient-text {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-mid), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: 32px;
    max-width: 500px;
    animation: fadeInUp 0.6s ease 0.2s forwards;
    opacity: 0;
}

.hero-cta {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 48px;
    animation: fadeInUp 0.6s ease 0.3s forwards;
    opacity: 0;
}

.hero-stats {
    display: flex;
    align-items: center;
    gap: 32px;
    animation: fadeInUp 0.6s ease 0.4s forwards;
    opacity: 0;
}

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

.stat-number {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: var(--border-color);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Hero Visual */
.hero-visual {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    animation: fadeIn 1s ease 0.5s forwards;
    opacity: 0;
}

@keyframes fadeIn {
    to { opacity: 1; }
}

/* Phone Mockup */
.phone-mockup {
    position: relative;
    width: 280px;
    background: linear-gradient(145deg, #1f1f23, #0f0f11);
    border-radius: 40px;
    padding: 12px;
    box-shadow: 
        0 50px 100px -20px rgba(0, 0, 0, 0.5),
        0 30px 60px -30px rgba(0, 0, 0, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.phone-mockup.large {
    width: 320px;
}

.phone-notch {
    position: absolute;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 28px;
    background: #000;
    border-radius: 20px;
    z-index: 10;
}

.phone-screen {
    background: #000;
    border-radius: 32px;
    overflow: hidden;
    aspect-ratio: 9/19.5;
}

.chat-screenshot {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top;
}

/* Floating Cards */
.floating-card {
    position: absolute;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 18px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    font-size: 0.9rem;
    font-weight: 500;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    animation: floatCard 6s ease-in-out infinite;
}

.card-icon {
    font-size: 1.2rem;
}

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

.card-2 {
    top: 50%;
    right: -15%;
    animation-delay: -2s;
}

.card-3 {
    bottom: 15%;
    left: -10%;
    animation-delay: -4s;
}

@keyframes floatCard {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-15px); }
}

/* ========================================
   Section Styles
   ======================================== */
.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 64px;
}

.section-tag {
    display: inline-block;
    padding: 6px 14px;
    background: rgba(37, 211, 102, 0.1);
    border: 1px solid rgba(37, 211, 102, 0.2);
    border-radius: 100px;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--accent-primary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 20px;
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 16px;
}

.section-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

/* ========================================
   Features Section
   ======================================== */
.features {
    padding: var(--section-padding) 0;
    background: var(--bg-secondary);
    position: relative;
}

.features::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
}

.feature-card {
    padding: 32px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--card-radius);
    transition: var(--transition-base);
    opacity: 0;
    transform: translateY(20px);
}

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

.feature-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.feature-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(37, 211, 102, 0.1), rgba(16, 185, 129, 0.1));
    border: 1px solid rgba(37, 211, 102, 0.2);
    border-radius: 14px;
    margin-bottom: 20px;
    color: var(--accent-primary);
}

.feature-card h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ========================================
   How It Works Section
   ======================================== */
.how-it-works {
    padding: var(--section-padding) 0;
}

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

.step {
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 32px;
    align-items: start;
    padding: 32px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--card-radius);
    opacity: 0;
    transform: translateX(-20px);
    transition: var(--transition-base);
}

.step.animate-in {
    opacity: 1;
    transform: translateX(0);
}

.step-number {
    font-size: 3rem;
    font-weight: 800;
    color: var(--accent-primary);
    opacity: 0.3;
    line-height: 1;
}

.step-content h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.step-content p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.step-visual {
    display: flex;
    flex-direction: column;
    gap: 8px;
    min-width: 200px;
}

.chat-bubble {
    padding: 10px 14px;
    border-radius: 16px;
    font-size: 0.85rem;
    max-width: 200px;
}

.chat-bubble.outgoing {
    background: var(--accent-primary);
    color: #000;
    align-self: flex-end;
    border-bottom-right-radius: 4px;
}

.chat-bubble.incoming {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    align-self: flex-start;
    border-bottom-left-radius: 4px;
}

.step-connector {
    width: 2px;
    height: 40px;
    background: linear-gradient(180deg, var(--accent-primary), transparent);
    margin: 0 auto;
    opacity: 0.3;
}

/* ========================================
   Demo Section
   ======================================== */
.demo {
    padding: var(--section-padding) 0;
    background: var(--bg-secondary);
}

.demo-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.demo-text {
    text-align: left;
}

.demo-text .section-header {
    text-align: left;
    margin: 0 0 32px;
}

.demo-highlights {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.highlight {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-secondary);
}

.highlight svg {
    color: var(--accent-primary);
    flex-shrink: 0;
}

.demo-visual {
    display: flex;
    justify-content: center;
}

/* ========================================
   Tech Stack Section
   ======================================== */
.tech-stack {
    padding: var(--section-padding) 0;
}

.tech-grid {
    display: flex;
    justify-content: center;
    gap: 48px;
    flex-wrap: wrap;
}

.tech-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    opacity: 0;
    transform: scale(0.9);
    transition: var(--transition-base);
}

.tech-item.animate-in {
    opacity: 1;
    transform: scale(1);
}

.tech-icon {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    color: var(--text-secondary);
    transition: var(--transition-base);
}

.tech-icon.express {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 600;
}

.tech-item:hover .tech-icon {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    transform: translateY(-4px);
}

.tech-item span:last-child {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* ========================================
   CTA Section
   ======================================== */
.cta {
    padding: var(--section-padding) 0;
}

.cta-card {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    padding: 60px;
    background: linear-gradient(135deg, var(--bg-card), var(--bg-tertiary));
    border: 1px solid var(--border-color);
    border-radius: 32px;
    align-items: center;
}

.cta-content h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.cta-content p {
    color: var(--text-secondary);
    margin-bottom: 24px;
    max-width: 400px;
}

.cta-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

/* Code Block */
.code-block {
    background: #0d0d0f;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
    font-family: var(--font-mono);
}

.code-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    background: rgba(255, 255, 255, 0.03);
    border-bottom: 1px solid var(--border-color);
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot.red { background: #ff5f57; }
.dot.yellow { background: #febc2e; }
.dot.green { background: #28c840; }

.filename {
    margin-left: auto;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.code-block pre {
    padding: 20px;
    margin: 0;
    overflow-x: auto;
}

.code-block code {
    font-size: 0.9rem;
    line-height: 1.8;
    color: var(--text-secondary);
}

.prompt {
    color: var(--accent-primary);
}

.success {
    color: var(--accent-primary);
}

/* ========================================
   Footer (Simple)
   ======================================== */
.footer-simple {
    padding: 40px 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
}

.footer-simple p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.footer-simple a {
    color: var(--accent-primary);
    font-weight: 500;
    transition: var(--transition-fast);
}

.footer-simple a:hover {
    color: var(--gradient-mid);
    text-decoration: underline;
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 1024px) {
    .hero {
        flex-direction: column;
        text-align: center;
        padding-top: 140px;
    }
    
    .hero-content {
        max-width: 100%;
    }
    
    .hero-description {
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero-cta {
        justify-content: center;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .floating-card {
        display: none;
    }
    
    .demo-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .demo-text .section-header {
        text-align: center;
    }
    
    .demo-highlights {
        align-items: center;
    }
    
    .cta-card {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .cta-content p {
        margin-left: auto;
        margin-right: auto;
    }
    
    .cta-buttons {
        justify-content: center;
    }
    
}

@media (max-width: 768px) {
    :root {
        --section-padding: 80px;
    }
    
    .nav-links {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .mobile-menu {
        display: flex;
    }
    
    .step {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .step-number {
        font-size: 2rem;
    }
    
    .step-visual {
        min-width: auto;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    
    .cta-card {
        padding: 40px 24px;
    }
}

@media (max-width: 480px) {
    .hero-stats {
        flex-direction: column;
        gap: 20px;
    }
    
    .stat-divider {
        width: 60px;
        height: 1px;
    }
    
    .phone-mockup {
        width: 240px;
    }
    
    .phone-mockup.large {
        width: 280px;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .cta-buttons {
        flex-direction: column;
    }
}