:root {
    /* Colors */
    --primary-blue: #0066FF;
    --primary-orange: #FF6B35;
    --white: #FFFFFF;
    --background-gray: #F5F7FA;
    --light-gray: #E2E8F0;
    --text-dark: #1A202C;
    --text-gray: #4A5568;
    --text-light: #718096;

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 15px 30px rgba(0, 0, 0, 0.15);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, var(--background-gray) 0%, var(--white) 100%);
    color: var(--text-dark);
    min-height: 100vh;
    padding-bottom: 0;
}

/* Header */
.header {
    position: sticky;
    top: 0;
    background: var(--white);
    border-bottom: 1px solid var(--light-gray);
    padding: var(--spacing-md) 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.logo-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    cursor: pointer;
    transition: opacity var(--transition-fast);
}

.logo-link:hover {
    opacity: 0.8;
}

.logo-text {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-blue);
}

.ai-badge {
    background: linear-gradient(135deg, var(--primary-blue), #0052CC);
    color: var(--white);
    font-size: 11px;
    font-weight: 600;
    padding: 4px 8px;
    border-radius: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Navigation Bar */
.nav-menu {
    display: flex;
    align-items: center;
    margin-left: auto;
}

.nav-links {
    display: flex;
    gap: var(--spacing-lg);
    list-style: none;
    margin-right: var(--spacing-lg);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.nav-link {
    text-decoration: none;
    color: var(--text-gray);
    font-weight: 500;
    font-size: 15px;
    transition: color var(--transition-fast);
    padding: var(--spacing-sm) var(--spacing-xs);
}

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

/* Mobile Menu Toggle */
.hamburger {
    display: none;
    background: none;
    border: none;
    color: var(--text-dark);
    font-size: 24px;
    cursor: pointer;
    padding: var(--spacing-sm);
}

/* Mobile Menu */
.mobile-menu {
    display: none;
    position: fixed;
    top: 73px;
    /* Header height */
    left: 0;
    width: 100%;
    background: var(--white);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-md);
    border-bottom: 1px solid var(--light-gray);
    z-index: 999;
}

.mobile-menu.active {
    display: block;
    animation: slideDown 0.3s ease-out;
}

.mobile-nav-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.mobile-nav-link {
    display: block;
    text-decoration: none;
    color: var(--text-dark);
    font-size: 16px;
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: background var(--transition-fast);
}

.mobile-nav-link:hover {
    background: var(--background-gray);
    color: var(--primary-blue);
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

    .hamburger {
        display: block;
    }
}

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

.language-button {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: var(--white);
    border: 1px solid var(--light-gray);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: inherit;
    font-size: 14px;
    color: var(--text-dark);
}

@media (max-width: 768px) {
    .language-button span:not(.flag):not(.dropdown-icon) {
        display: none;
    }

    .language-button {
        padding: var(--spacing-sm);
    }
}

.language-button:hover {
    border-color: var(--primary-blue);
    background: var(--background-gray);
}

.flag {
    font-size: 20px;
    line-height: 1;
    display: inline-flex;
    align-items: center;
    width: 20px;
    height: 15px;
    overflow: hidden;
}

.flag img {
    width: 100%;
    height: auto;
    display: block;
    object-fit: cover;
}

.dropdown-icon {
    transition: transform var(--transition-fast);
}

.language-button.active .dropdown-icon {
    transform: rotate(180deg);
}

.language-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    background: var(--white);
    border: 1px solid var(--light-gray);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-normal);
    z-index: 100;
}

.language-dropdown.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.language-option {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    width: 100%;
    padding: var(--spacing-md);
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit;
    font-size: 14px;
    color: var(--text-dark);
    transition: background var(--transition-fast);
    text-align: left;
}

.language-option:hover {
    background: var(--background-gray);
}

.language-option.selected {
    background: rgba(0, 102, 255, 0.1);
    color: var(--primary-blue);
    font-weight: 600;
}

/* Main Container */
.main-container {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
}

.chat-container {
    min-height: 60vh;
}

/* Welcome Screen */

.welcome-title {
    font-size: 42px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: var(--spacing-md);
}

.welcome-subtitle {
    font-size: 18px;
    color: var(--text-gray);
    margin-bottom: var(--spacing-xl);
}

.example-chips {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    justify-content: center;
    max-width: 700px;
    margin: 0 auto;
}

.example-chip {
    background: var(--white);
    border: 1px solid var(--light-gray);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 14px;
    color: var(--text-dark);
    box-shadow: var(--shadow-sm);
}

.example-chip:hover {
    border-color: var(--primary-blue);
    background: var(--background-gray);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Messages */
.messages {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.message {
    display: flex;
    gap: var(--spacing-md);
    animation: fadeIn var(--transition-normal);
}

.message.user {
    justify-content: flex-end;
}

.ai-avatar {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--primary-blue), #0052CC);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    flex-shrink: 0;
}

.message-bubble {
    max-width: 70%;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    font-size: 15px;
    line-height: 1.5;
}

.message.user .message-bubble {
    background: var(--primary-blue);
    color: var(--white);
    border-bottom-right-radius: 4px;
}

.message.ai .message-bubble {
    background: var(--white);
    color: var(--text-dark);
    border: 1px solid var(--light-gray);
    border-bottom-left-radius: 4px;
    box-shadow: var(--shadow-sm);
}

.message-timestamp {
    font-size: 11px;
    color: var(--text-light);
    margin-top: 4px;
    opacity: 0.7;
}

/* Product Cards */
.product-cards {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.product-card {
    display: flex;
    gap: var(--spacing-md);
    background: var(--white);
    border: 1px solid var(--light-gray);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    transition: all var(--transition-normal);
    cursor: pointer;
    animation: fadeIn var(--transition-normal);
}

.product-card:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary-blue);
}

.product-image {
    width: 150px;
    height: 150px;
    object-fit: contain;
    border-radius: var(--radius-sm);
    background: var(--background-gray);
    flex-shrink: 0;
}

.product-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.product-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-dark);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.product-rating {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 14px;
}

.stars {
    color: #FFA500;
}

.rating-count {
    color: var(--text-light);
    font-size: 13px;
}

.product-price {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-blue);
}

.discount-badge {
    display: inline-block;
    background: #FF4444;
    color: var(--white);
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 600;
    margin-left: var(--spacing-sm);
}

.product-recommendation {
    font-size: 13px;
    color: var(--text-gray);
    font-style: italic;
    margin-top: var(--spacing-xs);
}

.view-amazon-button {
    background: var(--primary-orange);
    color: var(--white);
    border: none;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    margin-top: auto;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.view-amazon-button:hover {
    background: #FF5520;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Typing Indicator */
.typing-indicator {
    display: flex;
    gap: var(--spacing-md);
    animation: fadeIn var(--transition-normal);
}

.typing-bubble {
    background: var(--white);
    border: 1px solid var(--light-gray);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    border-bottom-left-radius: 4px;
    box-shadow: var(--shadow-sm);
}

.typing-dots {
    display: flex;
    gap: 4px;
    align-items: center;
}

.typing-dots span {
    width: 8px;
    height: 8px;
    background: var(--primary-blue);
    border-radius: 50%;
    animation: bounce 1.4s infinite ease-in-out;
}

.typing-dots span:nth-child(1) {
    animation-delay: -0.32s;
}

.typing-dots span:nth-child(2) {
    animation-delay: -0.16s;
}

@keyframes bounce {

    0%,
    80%,
    100% {
        transform: scale(0);
        opacity: 0.5;
    }

    40% {
        transform: scale(1);
        opacity: 1;
    }
}

/* Welcome Screen */
.welcome-screen {
    text-align: center;
    padding-top: var(--spacing-xl);
    padding-bottom: var(--spacing-md);
    animation: fadeIn var(--transition-normal);
}

/* Input Zone */
.input-zone {
    position: relative;
    background: var(--white);
    border-top: 1px solid var(--light-gray);
    padding: var(--spacing-lg);
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.05);
    margin-top: 0;
}

.input-container {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-end;
}

.message-input {
    flex: 1;
    padding: var(--spacing-md) var(--spacing-lg);
    border: 1px solid var(--light-gray);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 15px;
    resize: none;
    max-height: 240px;
    transition: border-color var(--transition-fast);
}

.message-input:focus {
    outline: none;
    border-color: var(--primary-blue);
}

.message-input:disabled {
    background: var(--background-gray);
    cursor: not-allowed;
}

.send-button {
    background: var(--primary-orange);
    color: var(--white);
    border: none;
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.send-button:hover:not(:disabled) {
    background: #FF5520;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.send-button:disabled {
    background: var(--light-gray);
    cursor: not-allowed;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .welcome-title {
        font-size: 32px;
    }

    .welcome-subtitle {
        font-size: 16px;
    }

    .example-chips {
        flex-direction: column;
    }

    .message-bubble {
        max-width: 85%;
    }

    .product-card {
        flex-direction: column;
    }

    .product-image {
        width: 100%;
        height: 200px;
    }

    .language-button .language-name {
        display: none;
    }

    .main-container {
        padding: var(--spacing-lg) var(--spacing-md);
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .product-cards {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
    }

    .product-card {
        flex-direction: column;
    }

    .product-image {
        width: 100%;
        height: 180px;
    }
}

/* Loading Skeleton */
.skeleton {
    background: linear-gradient(90deg, var(--background-gray) 25%, #E8EDF2 50%, var(--background-gray) 75%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
}

@keyframes loading {
    0% {
        background-position: 200% 0;
    }

    100% {
        background-position: -200% 0;
    }
}

/* Error Message */
.error-message {
    background: #FEE;
    border: 1px solid #FCC;
    color: #C33;
    padding: var(--spacing-md);
    border-radius: var(--radius-sm);
    margin: var(--spacing-md) 0;
    font-size: 14px;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-gray);
}

.empty-state-icon {
    font-size: 48px;
    margin-bottom: var(--spacing-md);
}

/* Footer */
.footer {
    background: var(--white);
    border-top: 1px solid var(--light-gray);
    padding: var(--spacing-xl) var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.footer-content {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.footer-text {
    font-size: 13px;
    color: var(--text-light);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.footer-links {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.footer-link {
    font-size: 13px;
    color: var(--text-gray);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

.footer-separator {
    color: var(--text-light);
    font-size: 12px;
}

/* Newsletter Section */
.newsletter-section {
    max-width: 500px;
    margin: 0 auto var(--spacing-xl);
    text-align: center;
}

.newsletter-icon {
    font-size: 48px;
    margin-bottom: var(--spacing-md);
    animation: pulse 2s infinite;
}

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.1);
    }
}

.newsletter-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: var(--spacing-sm);
}

.newsletter-description {
    font-size: 14px;
    color: var(--text-gray);
    margin-bottom: var(--spacing-lg);
    line-height: 1.5;
}

.newsletter-form {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.newsletter-input {
    flex: 1;
    padding: var(--spacing-md) var(--spacing-lg);
    border: 1px solid var(--light-gray);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 15px;
    transition: all var(--transition-fast);
    background: var(--white);
}

.newsletter-input:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.1);
}

.newsletter-input::placeholder {
    color: var(--text-light);
}

.newsletter-button {
    background: linear-gradient(135deg, var(--primary-blue), #0052CC);
    color: var(--white);
    border: none;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
    min-width: 120px;
    position: relative;
}

.newsletter-button:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.newsletter-button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.button-loader {
    display: inline-flex;
    gap: 4px;
    align-items: center;
}

.button-loader span {
    width: 6px;
    height: 6px;
    background: var(--white);
    border-radius: 50%;
    animation: bounce 1.4s infinite ease-in-out;
}

.button-loader span:nth-child(1) {
    animation-delay: -0.32s;
}

.button-loader span:nth-child(2) {
    animation-delay: -0.16s;
}

.newsletter-message {
    font-size: 14px;
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    min-height: 20px;
    transition: all var(--transition-normal);
}

.newsletter-message.success {
    background: #D4EDDA;
    color: #155724;
    border: 1px solid #C3E6CB;
}

.newsletter-message.error {
    background: #F8D7DA;
    color: #721C24;
    border: 1px solid #F5C6CB;
}

.footer-divider {
    height: 1px;
    background: var(--light-gray);
    margin: var(--spacing-xl) 0;
}

@media (max-width: 768px) {
    .footer {
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .footer-text {
        font-size: 12px;
    }

    .footer-links {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .footer-separator {
        display: none;
    }

    .newsletter-form {
        flex-direction: column;
    }

    .newsletter-button {
        width: 100%;
    }

    .newsletter-title {
        font-size: 20px;
    }

    .newsletter-icon {
        font-size: 36px;
    }
}