/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-primary: #00bcd4;
    --color-primary-dark: #0097a7;
    --color-text: #212121;
    --color-text-light: #757575;
    --color-bg: #ffffff;
    --color-bg-light: #f5f5f5;
    --color-border: #e0e0e0;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    --shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.1);
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    padding: 20px 0;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid var(--color-border);
}

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

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
    text-decoration: none;
}

.nav-list {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-list a {
    text-decoration: none;
    color: var(--color-text);
    font-weight: 500;
    transition: var(--transition);
}

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

/* Language switcher */
.language-switcher {
    position: relative;
}

.lang-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    background: none;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: 8px 12px;
    cursor: pointer;
    transition: var(--transition);
}

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

.flag-icon {
    width: 20px;
    height: 15px;
    object-fit: cover;
}

.lang-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin-top: 5px;
    min-width: 140px;
    display: none;
    z-index: 1001;
}

.lang-dropdown.show {
    display: block;
}

.lang-option {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    padding: 10px 15px;
    background: none;
    border: none;
    cursor: pointer;
    text-align: left;
    transition: var(--transition);
}

.lang-option:hover {
    background-color: var(--color-bg-light);
}

/* Hero section */
.hero {
    padding: 150px 0 100px;
    position: relative;
    overflow: hidden;
}

.hero-content {
    max-width: 700px;
    position: relative;
    z-index: 2;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 20px;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-light);
    margin-bottom: 40px;
    max-width: 600px;
}

.cta-button {
    display: inline-block;
    background-color: var(--color-primary);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    padding: 15px 30px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.cta-button:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.cta-button.secondary {
    background-color: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

.cta-button.secondary:hover {
    background-color: rgba(0, 188, 212, 0.1);
}

.hero-decoration {
    position: absolute;
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    z-index: 1;
}

.circle {
    position: absolute;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(0, 188, 212, 0.1) 0%, rgba(0, 188, 212, 0) 70%);
}

.circle-1 {
    width: 300px;
    height: 300px;
    top: -100px;
    right: -100px;
}

.circle-2 {
    width: 200px;
    height: 200px;
    top: 50%;
    right: 10%;
}

.circle-3 {
    width: 150px;
    height: 150px;
    bottom: 0;
    right: 30%;
}

/* Features section */
.features {
    padding: 100px 0;
    background-color: var(--color-bg-light);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 60px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.feature-card {
    background: var(--color-bg);
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background-color: rgba(0, 188, 212, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.feature-icon i {
    font-size: 24px;
    color: var(--color-primary);
}

.feature-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 15px;
}

.feature-description {
    color: var(--color-text-light);
}

/* Demo section */
.demo {
    padding: 100px 0;
}

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

.demo-description {
    color: var(--color-text-light);
    margin-bottom: 30px;
}

.demo-list {
    list-style: none;
    margin-bottom: 30px;
}

.demo-list li {
    padding: 8px 0;
    padding-left: 30px;
    position: relative;
}

.demo-list li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: bold;
}

.chat-window-preview {
    background: var(--color-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    border: 1px solid var(--color-border);
}

.chat-header {
    display: flex;
    align-items: center;
    padding: 15px 20px;
    background-color: var(--color-bg-light);
    border-bottom: 1px solid var(--color-border);
}

.chat-bot-avatar {
    width: 40px;
    height: 40px;
    background-color: var(--color-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 15px;
}

.chat-bot-avatar i {
    color: white;
    font-size: 20px;
}

.chat-info h4 {
    font-size: 1rem;
    margin-bottom: 2px;
}

.chat-info span {
    font-size: 0.8rem;
    color: var(--color-text-light);
}

.chat-messages {
    padding: 20px;
    min-height: 200px;
}

.message {
    max-width: 80%;
    padding: 10px 15px;
    border-radius: 18px;
    margin-bottom: 15px;
}

.message.bot {
    background-color: var(--color-bg-light);
    align-self: flex-start;
}

.message.user {
    background-color: var(--color-primary);
    color: white;
    margin-left: auto;
}

/* Final CTA */
.final-cta {
    padding: 100px 0;
    background-color: var(--color-bg-light);
    text-align: center;
}

.cta-description {
    font-size: 1.2rem;
    color: var(--color-text-light);
    max-width: 700px;
    margin: 0 auto 40px;
}

/* Footer */
.footer {
    padding: 60px 0 30px;
    border-top: 1px solid var(--color-border);
}

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

.footer-tagline {
    color: var(--color-text-light);
    margin-top: 10px;
}

.footer-contacts h3 {
    margin-bottom: 20px;
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--color-text);
    text-decoration: none;
    transition: var(--transition);
}

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

.contact-link i {
    font-size: 1.2rem;
    width: 24px;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid var(--color-border);
    color: var(--color-text-light);
    font-size: 0.9rem;
}

/* Chat widget */
.chat-widget {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 1000;
}

.chat-widget-button {
    width: 60px;
    height: 60px;
    background-color: var(--color-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 4px 20px rgba(0, 188, 212, 0.3);
    transition: var(--transition);
    z-index: 1002;
}

.chat-widget-button:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 30px rgba(0, 188, 212, 0.4);
}

.chat-widget-button i {
    color: white;
    font-size: 24px;
}

.chat-widget-container {
    position: absolute;
    bottom: 80px;
    right: 0;
    width: 350px;
    background: var(--color-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-hover);
    border: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    max-height: 500px;
    
    /* Анимация открытия/закрытия */
    opacity: 0;
    transform: translateY(20px) scale(0.95);
    visibility: hidden;
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s;
    z-index: 1001;
}

.chat-widget-container.open {
    opacity: 1;
    transform: translateY(0) scale(1);
    visibility: visible;
}

.chat-body {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
    max-height: 350px;
}

.welcome-message {
    background-color: var(--color-bg-light);
    padding: 15px;
    border-radius: var(--border-radius);
    margin-bottom: 20px;
    text-align: center;
}

.chat-input-container {
    display: flex;
    padding: 15px;
    border-top: 1px solid var(--color-border);
}

.chat-input {
    flex: 1;
    padding: 12px 15px;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    font-family: inherit;
    outline: none;
}

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

.chat-send {
    background-color: var(--color-primary);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    width: 45px;
    margin-left: 10px;
    cursor: pointer;
    transition: var(--transition);
}

.chat-send:hover {
    background-color: var(--color-primary-dark);
}

.chat-close {
    background: none;
    border: none;
    color: var(--color-text-light);
    cursor: pointer;
    margin-left: auto;
    transition: var(--transition);
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

.chat-close:hover {
    background-color: var(--color-bg-light);
    color: var(--color-text);
}

/* Responsive design */
@media (max-width: 992px) {
    .hero-title {
        font-size: 2.8rem;
    }
    
    .demo-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .header-content {
        flex-wrap: wrap;
    }
    
    .nav {
        order: 3;
        width: 100%;
        margin-top: 15px;
    }
    
    .nav-list {
        justify-content: center;
    }
    
    .hero {
        padding: 130px 0 70px;
    }
    
    .hero-title {
        font-size: 2.2rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .chat-widget-container {
        width: 300px;
    }
}

@media (max-width: 576px) {
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .chat-widget-container {
        width: calc(100vw - 40px);
        right: -20px;
    }
    
    .chat-widget {
        right: 20px;
        bottom: 20px;
    }
}