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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    color: #fff;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
}

.header {
    text-align: center;
    margin-bottom: 30px;
    padding: 30px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.header p {
    font-size: 1.2em;
    opacity: 0.9;
}

.comparison-selector {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.comparison-btn {
    padding: 12px 30px;
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 25px;
    color: white;
    font-size: 1em;
    cursor: pointer;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.comparison-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

.comparison-btn.active {
    background: rgba(255, 255, 255, 0.4);
    border-color: #fff;
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.5);
}

.comparison-container {
    display: grid;
    grid-template-columns: 1fr 60px 1fr;
    gap: 20px;
    margin-bottom: 30px;
}

.comparison-column {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 30px;
    animation: fadeIn 0.5s ease;
}

.comparison-divider {
    display: flex;
    align-items: center;
    justify-content: center;
}

.divider-line {
    width: 2px;
    height: 100%;
    background: linear-gradient(to bottom,
        transparent 0%,
        rgba(255, 255, 255, 0.5) 50%,
        transparent 100%);
}

.divider-icon {
    position: absolute;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5em;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.column-header {
    font-size: 1.8em;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid rgba(255, 255, 255, 0.3);
    text-align: center;
}

.concept-label {
    display: inline-block;
    background: rgba(255, 255, 255, 0.2);
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.8em;
    margin-bottom: 10px;
}

.comparison-section {
    margin-bottom: 25px;
}

.section-title {
    font-size: 1.2em;
    font-weight: bold;
    margin-bottom: 10px;
    color: #ffd700;
}

.section-content {
    line-height: 1.6;
    opacity: 0.95;
}

.feature-list {
    list-style: none;
    margin-top: 10px;
}

.feature-list li {
    padding: 8px 0;
    padding-left: 25px;
    position: relative;
}

.feature-list li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #4ade80;
    font-weight: bold;
}

.similarity-box {
    background: rgba(255, 215, 0, 0.2);
    border: 2px solid rgba(255, 215, 0, 0.5);
    border-radius: 15px;
    padding: 20px;
    margin: 30px 0;
    text-align: center;
}

.similarity-box h3 {
    font-size: 1.3em;
    margin-bottom: 10px;
    color: #ffd700;
}

.use-cases {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-top: 30px;
}

.use-case-card {
    background: rgba(255, 255, 255, 0.15);
    border-radius: 15px;
    padding: 20px;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.use-case-card h4 {
    font-size: 1.1em;
    margin-bottom: 10px;
    color: #4ade80;
}

.navigation {
    display: flex;
    justify-content: space-between;
    gap: 15px;
    margin-top: 30px;
}

.nav-btn {
    padding: 15px 30px;
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 15px;
    color: white;
    text-decoration: none;
    font-size: 1em;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    border: none;
}

.nav-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

#loading {
    text-align: center;
    padding: 40px;
    font-size: 1.2em;
}

#loading.error {
    color: #ff6b6b;
    background: rgba(255, 107, 107, 0.1);
    border-radius: 15px;
    padding: 30px;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 968px) {
    .comparison-container {
        grid-template-columns: 1fr;
    }

    .comparison-divider {
        display: none;
    }

    .use-cases {
        grid-template-columns: 1fr;
    }
}