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

:root {
    --primary: #4F46E5;
    --primary-dark: #4338CA;
    --primary-light: #818CF8;
    --secondary: #10B981;
    --dark: #1F2937;
    --gray-100: #F3F4F6;
    --gray-200: #E5E7EB;
    --gray-300: #D1D5DB;
    --gray-400: #9CA3AF;
    --gray-500: #6B7280;
    --gray-600: #4B5563;
    --gray-700: #374151;
    --gray-800: #1F2937;
    --white: #FFFFFF;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--dark);
    background-color: var(--white);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Typography */
h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.2;
}

h1 { font-size: 3rem; }
h2 { font-size: 2.25rem; }
h3 { font-size: 1.5rem; }

@media (max-width: 768px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.25rem; }
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 8px;
    text-decoration: none;
    transition: all 0.2s ease;
    cursor: pointer;
    border: none;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}

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

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

.btn-white:hover {
    background: var(--gray-100);
    transform: translateY(-1px);
}

.btn-lg {
    padding: 16px 32px;
    font-size: 1.125rem;
}

.btn-block {
    width: 100%;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid var(--gray-200);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    color: var(--dark);
}

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

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

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

.nav-links a {
    text-decoration: none;
    color: var(--gray-600);
    font-weight: 500;
    transition: color 0.2s;
}

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

.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(--dark);
    transition: all 0.3s;
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--white);
    padding: 24px;
    border-bottom: 1px solid var(--gray-200);
    flex-direction: column;
    gap: 16px;
    z-index: 999;
}

.mobile-menu a {
    text-decoration: none;
    color: var(--gray-600);
    font-weight: 500;
    padding: 12px 0;
    border-bottom: 1px solid var(--gray-200);
}

.mobile-menu.active {
    display: flex;
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }
}

/* Hero Section */
.hero {
    padding: 120px 0 80px;
    background: linear-gradient(135deg, var(--gray-100) 0%, var(--white) 100%);
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.hero-content h1 {
    margin-bottom: 24px;
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.25rem;
    color: var(--gray-600);
    margin-bottom: 32px;
}

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

.hero-note {
    margin-top: 20px;
    font-size: 0.9375rem;
    color: var(--gray-500);
    display: flex;
    align-items: center;
    gap: 8px;
}

.hero-note::before {
    content: "";
    display: inline-block;
    width: 6px;
    height: 6px;
    background: var(--secondary);
    border-radius: 50%;
}

@media (max-width: 968px) {
    .hero-note {
        justify-content: center;
    }
}

/* Chat Demo */
.chat-demo {
    background: var(--white);
    border-radius: 16px;
    box-shadow: var(--shadow-xl);
    overflow: hidden;
}

.chat-demo-header {
    background: var(--gray-800);
    padding: 12px 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

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

.demo-dot.red { background: #EF4444; }
.demo-dot.yellow { background: #F59E0B; }
.demo-dot.green { background: #10B981; }

.demo-title {
    color: var(--gray-400);
    margin-left: 8px;
    font-size: 0.875rem;
}

.chat-demo-body {
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    min-height: 300px;
}

.demo-message {
    max-width: 80%;
    padding: 12px 16px;
    border-radius: 16px;
    font-size: 0.9375rem;
    line-height: 1.5;
}

.demo-message.bot {
    background: var(--gray-100);
    border-bottom-left-radius: 4px;
    align-self: flex-start;
}

.demo-message.user {
    background: var(--primary);
    color: var(--white);
    border-bottom-right-radius: 4px;
    align-self: flex-end;
}

.demo-message.typing {
    display: flex;
    gap: 4px;
    padding: 16px;
}

.typing-dot {
    width: 8px;
    height: 8px;
    background: var(--gray-400);
    border-radius: 50%;
    animation: typing 1.4s infinite ease-in-out;
}

.typing-dot:nth-child(1) { animation-delay: 0s; }
.typing-dot:nth-child(2) { animation-delay: 0.2s; }
.typing-dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes typing {
    0%, 60%, 100% { transform: translateY(0); }
    30% { transform: translateY(-8px); }
}

@media (max-width: 968px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-buttons {
        justify-content: center;
    }

    .hero-image {
        order: -1;
    }

    .chat-demo {
        max-width: 400px;
        margin: 0 auto;
    }
}

/* Section Header */
.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-header h2 {
    margin-bottom: 16px;
}

.section-header p {
    font-size: 1.125rem;
    color: var(--gray-500);
}

/* Features Section */
.features {
    padding: 100px 0;
    background: var(--white);
}

/* Primary Features - Highlighted */
.features-primary {
    display: flex;
    flex-direction: column;
    gap: 32px;
    margin-bottom: 64px;
}

.feature-highlight {
    display: flex;
    gap: 32px;
    padding: 40px;
    background: linear-gradient(135deg, var(--gray-100) 0%, var(--white) 100%);
    border: 2px solid var(--gray-200);
    border-radius: 20px;
    transition: all 0.3s ease;
}

.feature-highlight:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-lg);
}

.feature-highlight-icon {
    font-size: 3.5rem;
    flex-shrink: 0;
}

.feature-highlight-content {
    flex: 1;
}

.feature-highlight-content h3 {
    font-size: 1.5rem;
    margin-bottom: 12px;
    color: var(--primary);
}

.feature-highlight-content p {
    color: var(--gray-600);
    font-size: 1rem;
    line-height: 1.7;
    margin-bottom: 16px;
}

.feature-example {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 8px;
    padding: 10px 16px;
    font-size: 0.875rem;
}

.example-label {
    background: var(--primary);
    color: var(--white);
    padding: 4px 10px;
    border-radius: 4px;
    font-weight: 600;
    font-size: 0.75rem;
}

.example-text {
    color: var(--gray-700);
}

@media (max-width: 768px) {
    .feature-highlight {
        flex-direction: column;
        gap: 20px;
        padding: 28px;
    }

    .feature-highlight-icon {
        font-size: 2.5rem;
    }

    .feature-highlight-content h3 {
        font-size: 1.25rem;
    }

    .feature-example {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
}

/* Secondary Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.feature-card {
    padding: 32px;
    border-radius: 16px;
    background: var(--gray-100);
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.feature-card h3 {
    margin-bottom: 12px;
    font-size: 1.25rem;
}

.feature-card p {
    color: var(--gray-600);
    font-size: 0.9375rem;
}

@media (max-width: 968px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .features-grid {
        grid-template-columns: 1fr;
    }
}

/* How It Works */
.how-it-works {
    padding: 100px 0;
    background: var(--gray-100);
}

.steps {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: 24px;
}

.step {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    flex: 1;
    max-width: 280px;
}

.step-number {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: var(--primary);
    color: var(--white);
    font-size: 1.5rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
}

.step-content h3 {
    margin-bottom: 12px;
}

.step-content p {
    color: var(--gray-600);
}

.step-line {
    width: 80px;
    height: 2px;
    background: var(--gray-300);
    margin-top: 32px;
}

@media (max-width: 768px) {
    .steps {
        flex-direction: column;
        align-items: center;
    }

    .step-line {
        width: 2px;
        height: 40px;
        margin: 0;
    }
}

/* Pricing Section */
.pricing {
    padding: 100px 0;
    background: var(--white);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    align-items: start;
}

.pricing-card {
    background: var(--white);
    border: 2px solid var(--gray-200);
    border-radius: 16px;
    padding: 32px;
    position: relative;
    transition: all 0.3s ease;
}

.pricing-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
}

.pricing-card.featured {
    border-color: var(--primary);
    box-shadow: var(--shadow-lg);
}

.pricing-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary);
    color: var(--white);
    padding: 4px 16px;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
}

.pricing-header {
    text-align: center;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--gray-200);
    margin-bottom: 24px;
}

.pricing-header h3 {
    margin-bottom: 16px;
}

.price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 4px;
}

.currency {
    font-size: 1.25rem;
    color: var(--gray-600);
}

.amount {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--dark);
}

.period {
    font-size: 1rem;
    color: var(--gray-500);
}

.pricing-features {
    list-style: none;
    margin-bottom: 32px;
}

.pricing-features li {
    padding: 12px 0;
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--gray-600);
}

.pricing-features li::before {
    content: "✓";
    color: var(--secondary);
    font-weight: 700;
}

/* Single pricing card layout */
.pricing-single {
    display: flex;
    justify-content: center;
}

.pricing-single .pricing-card {
    max-width: 480px;
    width: 100%;
}

.pricing-single .pricing-card .amount {
    font-size: 3rem;
}

.pricing-note {
    margin-top: 16px;
    font-size: 0.875rem;
    color: var(--gray-500);
    text-align: center;
}

@media (max-width: 968px) {
    .pricing-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
        margin: 0 auto;
    }

    .pricing-card.featured {
        order: -1;
    }
}

/* CTA Section */
.cta {
    padding: 100px 0;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white);
    text-align: center;
}

.cta h2 {
    margin-bottom: 16px;
}

.cta p {
    font-size: 1.25rem;
    opacity: 0.9;
    margin-bottom: 32px;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 16px;
}

/* Footer */
.footer {
    padding: 64px 0 32px;
    background: var(--gray-800);
    color: var(--gray-300);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-brand p {
    margin-top: 16px;
    color: var(--gray-400);
}

.footer-brand .logo-text {
    color: var(--white);
}

.footer-links h4 {
    color: var(--white);
    margin-bottom: 16px;
    font-size: 1rem;
}

.footer-links a {
    display: block;
    color: var(--gray-400);
    text-decoration: none;
    padding: 8px 0;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: var(--white);
}

.footer-bottom {
    padding-top: 32px;
    border-top: 1px solid var(--gray-700);
    text-align: center;
    color: var(--gray-500);
}

@media (max-width: 768px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }

    .footer-brand {
        grid-column: 1 / -1;
    }
}

@media (max-width: 480px) {
    .footer-grid {
        grid-template-columns: 1fr;
    }
}