/* Base Styles */
:root {
    --dark-bg: #0A1931;
    --light-text: #FFFFFF;
    --accent-cyan: #00FFFF;
    --accent-gold: #FFD700;
    --gradient-dark: linear-gradient(135deg, #0A1931 0%, #0F2447 100%);
    --gradient-glow: linear-gradient(135deg, rgba(0, 255, 255, 0.1) 0%, rgba(255, 215, 0, 0.1) 100%);
}

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

body {
    font-family: 'Roboto', sans-serif;
    background-color: var(--dark-bg);
    color: var(--light-text);
    line-height: 1.6;
    overflow-x: hidden;
}

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

h1, h2, h3, h4, h5, h6 {
    font-family: 'Orbitron', sans-serif;
    margin-bottom: 1rem;
    line-height: 1.2;
}

h1 {
    font-size: 3rem;
}

h2 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    text-align: center;
    background: linear-gradient(to right, var(--accent-cyan), var(--accent-gold));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

h3 {
    font-size: 1.5rem;
    color: var(--accent-cyan);
}

p {
    margin-bottom: 1rem;
}

a {
    color: var(--accent-cyan);
    text-decoration: none;
    transition: all 0.3s ease;
}

a:hover {
    color: var(--accent-gold);
}

section {
    padding: 80px 0;
}

.section-intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 3rem;
    font-size: 1.2rem;
}

img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
}

/* Header Styles */
header {
    background: var(--gradient-dark);
    padding: 40px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-glow);
    opacity: 0.5;
    z-index: 0;
}

header .container {
    position: relative;
    z-index: 1;
}

.subtitle {
    font-size: 1.5rem;
    margin-top: 0.5rem;
    color: var(--accent-gold);
}

/* Navigation Styles */
nav {
    background-color: rgba(10, 25, 49, 0.9);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0, 255, 255, 0.2);
}

nav ul {
    display: flex;
    justify-content: center;
    list-style: none;
}

nav li {
    margin: 0 15px;
}

nav a {
    display: block;
    padding: 20px 10px;
    font-family: 'Orbitron', sans-serif;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
    position: relative;
}

nav a::after {
    content: '';
    position: absolute;
    bottom: 15px;
    left: 10px;
    width: 0;
    height: 2px;
    background: linear-gradient(to right, var(--accent-cyan), var(--accent-gold));
    transition: width 0.3s ease;
}

nav a:hover::after {
    width: calc(100% - 20px);
}

/* Hero Section */
.hero {
    background: var(--gradient-dark);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-glow);
    opacity: 0.3;
    z-index: 0;
}

.hero .container {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    gap: 40px;
}

.hero-content {
    flex: 1;
}

.hero-image {
    flex: 1;
    text-align: center;
}

.hero-image img {
    max-width: 100%;
    border-radius: 10px;
    box-shadow: 0 0 30px rgba(0, 255, 255, 0.3);
}

.cta-buttons {
    margin-top: 2rem;
    display: flex;
    gap: 20px;
}

.btn {
    display: inline-block;
    padding: 12px 24px;
    background: linear-gradient(135deg, var(--accent-cyan) 0%, rgba(0, 255, 255, 0.7) 100%);
    color: var(--dark-bg);
    font-family: 'Orbitron', sans-serif;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
    border-radius: 30px;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0, 255, 255, 0.3);
    color: var(--dark-bg);
}

.btn-secondary {
    background: linear-gradient(135deg, var(--accent-gold) 0%, rgba(255, 215, 0, 0.7) 100%);
}

.btn-secondary:hover {
    box-shadow: 0 10px 20px rgba(255, 215, 0, 0.3);
}

/* Challenges Grid */
.challenges-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.challenge-card {
    background: rgba(15, 36, 71, 0.6);
    border-radius: 10px;
    padding: 30px;
    transition: all 0.3s ease;
    border: 1px solid rgba(0, 255, 255, 0.1);
    height: 100%;
    display: flex;
    flex-direction: column;
}

.challenge-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 255, 255, 0.2);
    border-color: rgba(0, 255, 255, 0.3);
}

.challenge-icon {
    margin-bottom: 20px;
    text-align: center;
}

.challenge-icon img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 8px;
}

/* Solutions Accordion */
.accordion {
    margin-top: 40px;
}

.accordion-item {
    margin-bottom: 15px;
    border-radius: 8px;
    overflow: hidden;
    background: rgba(15, 36, 71, 0.6);
    border: 1px solid rgba(0, 255, 255, 0.1);
}

.accordion-header {
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.accordion-header:hover {
    background: rgba(0, 255, 255, 0.1);
}

.accordion-header h3 {
    margin: 0;
}

.accordion-icon {
    font-size: 1.5rem;
    color: var(--accent-cyan);
    transition: all 0.3s ease;
}

.accordion-item.active .accordion-icon {
    transform: rotate(45deg);
}

.accordion-content {
    padding: 0 20px;
    max-height: 0;
    overflow: hidden;
    transition: all 0.3s ease;
}

.accordion-item.active .accordion-content {
    padding: 0 20px 20px;
    max-height: 500px;
}

.accordion-content ul {
    list-style-position: inside;
    padding-left: 20px;
}

.accordion-content li {
    margin-bottom: 10px;
}

/* Visualizations */
.visualization-tabs {
    margin-top: 40px;
}

.tab-buttons {
    display: flex;
    justify-content: center;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.tab-button {
    padding: 12px 24px;
    background: rgba(15, 36, 71, 0.6);
    color: var(--light-text);
    font-family: 'Orbitron', sans-serif;
    border: 1px solid rgba(0, 255, 255, 0.2);
    cursor: pointer;
    transition: all 0.3s ease;
    margin: 5px;
}

.tab-button:hover, .tab-button.active {
    background: rgba(0, 255, 255, 0.2);
    border-color: var(--accent-cyan);
}

.tab-pane {
    display: none;
}

.tab-pane.active {
    display: block;
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.visualization-container {
    margin-bottom: 30px;
    text-align: center;
}

.visualization-container img {
    max-width: 100%;
    max-height: 400px;
    object-fit: contain;
}

.visualization-description {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

/* Conclusion Section */
.conclusion-content {
    display: flex;
    align-items: center;
    gap: 40px;
}

.conclusion-text {
    flex: 1;
}

.conclusion-image {
    flex: 1;
    text-align: center;
}

.conclusion-image img {
    max-width: 100%;
    border-radius: 10px;
    box-shadow: 0 0 30px rgba(255, 215, 0, 0.3);
}

/* Footer */
footer {
    background: var(--gradient-dark);
    padding: 40px 0;
    text-align: center;
    border-top: 1px solid rgba(0, 255, 255, 0.2);
}

/* Responsive Styles */
@media (max-width: 992px) {
    .hero .container, .conclusion-content {
        flex-direction: column;
    }
    
    .hero-image, .conclusion-image {
        margin-top: 30px;
    }
    
    .challenges-grid {
        grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    }
}

@media (max-width: 768px) {
    h1 {
        font-size: 2.5rem;
    }
    
    h2 {
        font-size: 2rem;
    }
    
    nav ul {
        flex-direction: column;
        align-items: center;
    }
    
    nav li {
        margin: 5px 0;
    }
    
    .cta-buttons {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        text-align: center;
        margin-bottom: 10px;
    }
    
    .challenges-grid {
        grid-template-columns: 1fr;
    }
}

/* Animation */
@keyframes glow {
    0% {
        box-shadow: 0 0 5px rgba(0, 255, 255, 0.5);
    }
    50% {
        box-shadow: 0 0 20px rgba(0, 255, 255, 0.8), 0 0 30px rgba(255, 215, 0, 0.5);
    }
    100% {
        box-shadow: 0 0 5px rgba(0, 255, 255, 0.5);
    }
}