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

:root {
    /* Color Palette */
    --primary-color: #02b9d4;
    --secondary-color: #7c3aed;
    --accent-color: #059669;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --background-light: #ffffff;
    --background-gray: #292a2b;
    --border-color: #e5e7eb;
    --shadow-light: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-large: 0 10px 15px rgba(0, 0, 0, 0.1);
    
    /* Typography */
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Transitions */
    --transition-fast: 0.15s ease-in-out;
    --transition-normal: 0.3s ease-in-out;
    --transition-slow: 0.5s ease-in-out;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background-light);
}

/* Skip Link for Screen Readers */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--primary-color);
    color: white;
    padding: 8px;
    text-decoration: none;
    border-radius: var(--radius-sm);
    z-index: 1000;
    transition: var(--transition-fast);
}

.skip-link:focus {
    top: 6px;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Header */
.header {
    background: var(--background-light);
    box-shadow: var(--shadow-light);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar {
    padding: var(--spacing-md) 0;
}

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

.nav-logo h1 {
    font-size: var(--font-size-xl);
    font-weight: 700;
}

.nav-logo a {
    text-decoration: none;
    color: var(--primary-color);
    transition: var(--transition-fast);
}

.nav-logo a:hover,
.nav-logo a:focus {
    color: var(--secondary-color);
}

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

.nav-menu a {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
    position: relative;
}

.nav-menu a:hover,
.nav-menu a:focus {
    background-color: var(--background-gray);
    color: var(--primary-color);
}

.nav-menu a[aria-current="page"] {
    color: var(--primary-color);
    background-color: var(--background-gray);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    margin: 3px 0;
    transition: var(--transition-fast);
}

/* Main Content */
.main-content {
    min-height: calc(100vh - 200px);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: var(--spacing-3xl) 0;
    text-align: center;
}

.hero-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.hero-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    line-height: 1.2;
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-2xl);
    opacity: 0.9;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-lg);
    text-decoration: none;
    font-weight: 600;
    text-align: center;
    transition: var(--transition-normal);
    border: 2px solid transparent;
    cursor: pointer;
    font-size: var(--font-size-base);
}

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

.btn-primary:hover,
.btn-primary:focus {
    background-color: #047857;
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.btn-secondary {
    background-color: transparent;
    color: white;
    border-color: white;
}

.btn-secondary:hover,
.btn-secondary:focus {
    background-color: white;
    color: var(--primary-color);
}

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

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

/* Sections */
section {
    padding: var(--spacing-3xl) 0;
}

section:nth-child(even) {
    background-color: var(--background-gray);
}

section h2 {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    color: var(--text-primary);
}

/* Diversity Section */
.diversity-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.diversity-card {
    background: var(--background-light);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-light);
    text-align: center;
    transition: var(--transition-normal);
}

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

.card-icon {
    font-size: var(--font-size-4xl);
    color: var(--primary-color);
    margin-bottom: var(--spacing-lg);
}

.diversity-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.diversity-card p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.card-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition-fast);
}

.card-link:hover,
.card-link:focus {
    color: var(--secondary-color);
    text-decoration: underline;
}

/* Importance Section */
.importance-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
    margin-top: var(--spacing-xl);
}

.importance-text p {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

.importance-demo {
    text-align: center;
}

.demo-button {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    padding: var(--spacing-xl);
    border-radius: 50%;
    font-size: var(--font-size-2xl);
    cursor: pointer;
    transition: var(--transition-normal);
    width: 120px;
    height: 120px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.demo-button:hover,
.demo-button:focus {
    transform: scale(1.1);
    box-shadow: var(--shadow-large);
}

/* Technologies Section */
.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.tech-item {
    text-align: center;
    padding: var(--spacing-lg);
    background: var(--background-light);
    border-radius: var(--radius-lg);
    transition: var(--transition-normal);
}

.tech-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
}

.tech-item i {
    font-size: var(--font-size-3xl);
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.tech-item h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
}

.tech-cta {
    text-align: center;
}

/* ODS Section */
.ods-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.ods-text p {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

.ods-icon {
    text-align: center;
}

.ods-icon i {
    font-size: 8rem;
    color: var(--accent-color);
}

/* AI Chatbot */
.ai-chatbot-btn {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    font-size: var(--font-size-xl);
    cursor: pointer;
    box-shadow: var(--shadow-large);
    transition: var(--transition-normal);
    z-index: 1000;
}

.ai-chatbot-btn:hover,
.ai-chatbot-btn:focus {
    transform: scale(1.1);
}

.chatbot-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1001;
    align-items: flex-end;
    justify-content: flex-end;
    padding: var(--spacing-xl);
    box-sizing: border-box;
}

.chatbot-content {
    width: 350px;
    height: 500px;
    background: var(--background-light);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-large);
    display: flex;
    flex-direction: column;
    margin-bottom: 80px; /* Space above the chatbot button */
}

.chatbot-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.chatbot-header h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.close-btn {
    background: none;
    border: none;
    font-size: var(--font-size-xl);
    cursor: pointer;
    color: var(--text-secondary);
}

.chatbot-messages {
    flex: 1;
    padding: var(--spacing-lg);
    overflow-y: auto;
}

.chatbot-input {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: var(--spacing-sm);
}

.chatbot-input input {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
}

.chatbot-input button {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    cursor: pointer;
}

/* Footer */
.footer {
    background: var(--text-primary);
    color: rgb(0, 0, 0);
    padding: var(--spacing-xl) 0;
    text-align: center;
}

.footer p {
    font-size: var(--font-size-sm);
    opacity: 0.8;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--background-light);
        flex-direction: column;
        justify-content: flex-start;
        align-items: center;
        padding-top: var(--spacing-2xl);
        transition: var(--transition-normal);
        box-shadow: var(--shadow-medium);
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-toggle {
        display: flex;
    }

    .hero-title {
        font-size: var(--font-size-3xl);
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .importance-content,
    .ods-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .diversity-grid {
        grid-template-columns: 1fr;
    }

    .tech-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .chatbot-content {
        width: calc(100% - 2rem);
        height: calc(100% - 2rem);
        bottom: var(--spacing-md);
        right: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: var(--font-size-2xl);
    }

    .tech-grid {
        grid-template-columns: 1fr;
    }

    .demo-button {
        width: 100px;
        height: 100px;
        font-size: var(--font-size-lg);
    }
}

/* Focus Styles for Accessibility */
*:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    :root {
        --primary-color: #0000ff;
        --secondary-color: #800080;
        --text-primary: #000000;
        --background-light: #ffffff;
        --border-color: #000000;
    }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Chat Messages Styles */
.chat-message {
    margin-bottom: var(--spacing-md);
    display: flex;
    flex-direction: column;
}

.chat-message.user {
    align-items: flex-end;
}

.chat-message.bot {
    align-items: flex-start;
}

.chat-message .message-content {
    background: var(--background-gray);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-lg);
    max-width: 80%;
    word-wrap: break-word;
}

.chat-message.user .message-content {
    background: var(--primary-color);
    color: white;
}

.chat-message .message-time {
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
    margin-top: var(--spacing-xs);
    padding: 0 var(--spacing-sm);
}