* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #10b981;
    --primary-dark: #059669;
    --primary-light: #34d399;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-900: #111827;
    --white: #ffffff;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--gray-900);
    background: var(--white);
    line-height: 1.6;
    overflow-x: hidden;
}

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

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--gray-200);
    z-index: 1000;
    padding: 16px 0;
}

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

.logo-img {
    height: 40px;
}

.nav {
    display: flex;
    gap: 32px;
}

.nav-link {
    text-decoration: none;
    color: var(--gray-700);
    font-weight: 500;
    font-size: 15px;
    transition: color 0.2s;
}

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

.header-cta {
    display: flex;
    gap: 12px;
    align-items: center;
}

.btn-login {
    text-decoration: none;
    color: var(--gray-700);
    font-weight: 500;
    padding: 8px 20px;
    border-radius: 8px;
    transition: background 0.2s;
}

.btn-login:hover {
    background: var(--gray-100);
}

.btn-primary {
    background: var(--primary);
    color: white;
    padding: 10px 24px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.2s;
    border: none;
    cursor: pointer;
    display: inline-block;
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 10px 25px rgba(16, 185, 129, 0.3);
}

.btn-secondary {
    background: white;
    color: var(--primary);
    padding: 10px 24px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    border: 2px solid var(--primary);
    transition: all 0.2s;
    display: inline-block;
}

.btn-secondary:hover {
    background: var(--gray-50);
}

.btn-large {
    padding: 14px 32px;
    font-size: 16px;
}

.btn-block {
    width: 100%;
    text-align: center;
}

/* Hero */
.hero {
    padding: 140px 0 80px;
    background: linear-gradient(135deg, var(--gray-50) 0%, white 100%);
}

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

.hero-title {
    font-size: 56px;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 24px;
    color: var(--gray-900);
}

.highlight {
    color: var(--primary);
    position: relative;
}

.hero-description {
    font-size: 20px;
    color: var(--gray-600);
    margin-bottom: 40px;
    line-height: 1.6;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 40px;
    padding: 24px;
    background: white;
    border-radius: 16px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.stat-number {
    font-size: 32px;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 4px;
}

.stat-label {
    font-size: 14px;
    color: var(--gray-600);
}

.hero-buttons {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
}

.hero-note {
    color: var(--gray-600);
    font-size: 14px;
}

/* Demo Chat */
.demo-chat {
    background: white;
    border-radius: 24px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
    overflow: hidden;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

.chat-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.chat-avatar img {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: white;
    padding: 6px;
}

.chat-name {
    font-weight: 700;
    color: white;
    font-size: 16px;
}

.chat-status {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.8);
}

.chat-messages {
    padding: 20px;
    min-height: 280px;
    background: var(--gray-50);
}

.message {
    margin-bottom: 16px;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message-bubble {
    background: white;
    padding: 14px 18px;
    border-radius: 16px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    max-width: 85%;
    display: inline-block;
    line-height: 1.5;
    font-size: 14px;
}

.message.sent .message-bubble {
    background: var(--primary);
    color: white;
    float: right;
}

.chat-input-area {
    padding: 16px;
    background: white;
    border-top: 1px solid var(--gray-200);
    display: flex;
    gap: 12px;
}

.chat-input {
    flex: 1;
    padding: 12px 16px;
    border: 1px solid var(--gray-300);
    border-radius: 24px;
    font-size: 14px;
    outline: none;
}

.chat-input:focus {
    border-color: var(--primary);
}

.chat-send {
    width: 48px;
    height: 48px;
    background: var(--primary);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    font-size: 20px;
    transition: all 0.2s;
}

.chat-send:hover {
    background: var(--primary-dark);
    transform: scale(1.05);
}

/* Sections */
section {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: 42px;
    font-weight: 800;
    margin-bottom: 16px;
    color: var(--gray-900);
}

.section-subtitle {
    font-size: 18px;
    color: var(--gray-600);
}

/* How It Works */
.how-it-works {
    background: var(--gray-50);
}

.steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.step {
    background: white;
    padding: 40px;
    border-radius: 16px;
    text-align: center;
    position: relative;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: transform 0.2s;
}

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

.step-number {
    position: absolute;
    top: -16px;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 40px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 18px;
}

.step-icon {
    font-size: 64px;
    margin-bottom: 24px;
}

.step-title {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--gray-900);
}

.step-description {
    color: var(--gray-600);
    line-height: 1.6;
}

/* Features */
.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.feature-card {
    background: white;
    padding: 32px;
    border-radius: 16px;
    border: 1px solid var(--gray-200);
    transition: all 0.2s;
}

.feature-card:hover {
    border-color: var(--primary);
    box-shadow: 0 8px 16px rgba(16, 185, 129, 0.1);
    transform: translateY(-2px);
}

.feature-icon {
    font-size: 40px;
    margin-bottom: 20px;
}

.feature-title {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--gray-900);
}

.feature-description {
    color: var(--gray-600);
    font-size: 14px;
    line-height: 1.6;
}

/* Pricing */
.pricing {
    background: var(--gray-50);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    margin-bottom: 40px;
}

.pricing-card {
    background: white;
    padding: 40px;
    border-radius: 16px;
    border: 2px solid var(--gray-200);
    position: relative;
    transition: all 0.2s;
}

.pricing-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(16, 185, 129, 0.15);
}

.pricing-card.highlighted {
    border-color: var(--primary);
    box-shadow: 0 8px 16px rgba(16, 185, 129, 0.2);
    transform: scale(1.05);
}

.pricing-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary);
    color: white;
    padding: 6px 20px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
}

.pricing-title {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 16px;
    text-align: center;
}

.pricing-price {
    text-align: center;
    margin-bottom: 32px;
}

.currency {
    font-size: 24px;
    font-weight: 600;
    color: var(--gray-600);
}

.amount {
    font-size: 56px;
    font-weight: 800;
    color: var(--primary);
}

.period {
    font-size: 18px;
    color: var(--gray-600);
}

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

.pricing-features li {
    padding: 12px 0;
    color: var(--gray-700);
    border-bottom: 1px solid var(--gray-100);
}

.guarantee {
    background: white;
    padding: 24px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    gap: 16px;
    justify-content: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.guarantee-badge {
    font-size: 32px;
}

.guarantee-text {
    font-size: 16px;
    color: var(--gray-700);
}

/* Testimonials */
.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.testimonial-card {
    background: white;
    padding: 32px;
    border-radius: 16px;
    border: 1px solid var(--gray-200);
    transition: all 0.2s;
}

.testimonial-card:hover {
    border-color: var(--primary);
    box-shadow: 0 8px 16px rgba(16, 185, 129, 0.1);
}

.testimonial-stars {
    color: #fbbf24;
    font-size: 20px;
    margin-bottom: 16px;
}

.testimonial-text {
    color: var(--gray-700);
    line-height: 1.7;
    margin-bottom: 20px;
    font-style: italic;
}

.testimonial-author {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.testimonial-author strong {
    color: var(--gray-900);
    font-weight: 600;
}

.testimonial-author span {
    color: var(--gray-600);
    font-size: 14px;
}

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

.cta-title {
    font-size: 48px;
    font-weight: 800;
    margin-bottom: 20px;
}

.cta-description {
    font-size: 20px;
    margin-bottom: 32px;
    opacity: 0.95;
}

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

.cta-final .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.2);
}

.cta-note {
    margin-top: 16px;
    opacity: 0.9;
}

/* Footer */
.footer {
    background: var(--gray-900);
    color: white;
    padding: 60px 0 24px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-logo {
    height: 36px;
    margin-bottom: 16px;
    filter: brightness(0) invert(1);
}

.footer-description {
    color: var(--gray-300);
    line-height: 1.6;
}

.footer-title {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 16px;
}

.footer-link {
    display: block;
    color: var(--gray-300);
    text-decoration: none;
    margin-bottom: 12px;
    transition: color 0.2s;
}

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

.footer-bottom {
    border-top: 1px solid var(--gray-700);
    padding-top: 24px;
    text-align: center;
    color: var(--gray-400);
}

/* Mobile */
@media (max-width: 768px) {
    .nav, .header-cta {
        display: none;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
    }
    
    .hero-title {
        font-size: 36px;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .steps {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .pricing-grid {
        grid-template-columns: 1fr;
    }
    
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
}