* {
    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;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #333;
}

.container {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.15);
    max-width: 800px;
    width: 90%;
    backdrop-filter: blur(10px);
    margin: 20px;
}

/* Header Styling */
header {
    text-align: center;
    margin-bottom: 40px;
}

header h1 {
    font-size: 2.5rem;
    color: #2d3748;
    margin-bottom: 10px;
    font-weight: 600;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 1.1rem;
    color: #4a5568;
    font-weight: 400;
    opacity: 0.8;
}

/* Welcome Section */
.welcome-section {
    margin-bottom: 35px;
    padding: 25px;
    background: rgba(255, 255, 255, 0.7);
    border-radius: 15px;
    border-left: 4px solid #667eea;
    text-align: center;
}

.welcome-section h2 {
    font-size: 1.5rem;
    color: #2d3748;
    margin-bottom: 15px;
    font-weight: 600;
}

.welcome-section p {
    font-size: 1rem;
    line-height: 1.6;
    color: #4a5568;
}

/* Feature Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
    margin: 40px 0;
}

.feature-card {
    background: rgba(255, 255, 255, 0.98);
    padding: 25px;
    border-radius: 15px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    transition: all 0.4s ease;
    text-align: center;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.15);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 15px;
    display: block;
}

.feature-card h3 {
    font-size: 1.2rem;
    color: #2d3748;
    margin-bottom: 12px;
    font-weight: 600;
}

.feature-card p {
    font-size: 0.95rem;
    line-height: 1.5;
    color: #4a5568;
}

/* Session Info */
.session-info {
    margin-bottom: 35px;
    padding: 25px;
    background: rgba(52, 152, 219, 0.1);
    border-radius: 15px;
    border-left: 4px solid #3498db;
}

.session-info h3 {
    font-size: 1.3rem;
    color: #2d3748;
    margin-bottom: 20px;
    font-weight: 600;
    text-align: center;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
}

.info-item {
    padding: 15px;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 10px;
    border: 1px solid rgba(226, 232, 240, 0.5);
    transition: all 0.3s ease;
}

.info-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.info-item strong {
    color: #667eea;
    font-weight: 600;
}

/* Start Section */
.start-section {
    text-align: center;
    margin-bottom: 30px;
}

.start-button {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 18px 40px;
    font-size: 1.2rem;
    font-weight: 600;
    border-radius: 30px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 12px 30px rgba(102, 126, 234, 0.4);
    text-transform: uppercase;
    letter-spacing: 1px;
    min-width: 280px;
}

.start-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 18px 40px rgba(102, 126, 234, 0.5);
}

.start-button:active {
    transform: translateY(-1px);
}

.session-note {
    margin-top: 20px;
    padding: 15px;
    background: rgba(241, 196, 15, 0.1);
    border-radius: 10px;
    border-left: 3px solid #f1c40f;
}

.session-note p {
    margin: 0;
    font-size: 0.9rem;
    color: #856404;
    text-align: center;
    font-style: italic;
}

/* Disclaimer */
.disclaimer {
    padding: 20px;
    background: rgba(231, 76, 60, 0.1);
    border-radius: 15px;
    border-left: 4px solid #e74c3c;
    margin-top: 30px;
}

.disclaimer h4 {
    font-size: 1.1rem;
    color: #c0392b;
    margin-bottom: 10px;
    font-weight: 600;
}

.disclaimer p {
    font-size: 0.9rem;
    line-height: 1.5;
    color: #a94442;
    margin-bottom: 10px;
}

.disclaimer p:last-child {
    margin-bottom: 0;
}

.disclaimer strong {
    color: #c0392b;
}

/* Animation for page load */
.container {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.8s ease forwards;
}

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

/* Feature cards staggered animation */
.feature-card {
    opacity: 0;
    transform: translateY(30px);
    animation: slideUp 0.6s ease forwards;
}

.feature-card:nth-child(1) { animation-delay: 0.2s; }
.feature-card:nth-child(2) { animation-delay: 0.4s; }
.feature-card:nth-child(3) { animation-delay: 0.6s; }
.feature-card:nth-child(4) { animation-delay: 0.8s; }

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

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 25px;
        margin: 15px;
        max-width: 95%;
    }

    header h1 {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    .features-grid {
        grid-template-columns: 1fr;
        gap: 20px;
        margin: 30px 0;
    }

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

    .start-button {
        padding: 16px 35px;
        font-size: 1.1rem;
        min-width: 250px;
    }

    .feature-icon {
        font-size: 2rem;
    }

    .welcome-section,
    .session-info,
    .disclaimer {
        padding: 20px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 20px;
        margin: 10px;
    }

    header h1 {
        font-size: 1.8rem;
    }

    .start-button {
        width: 100%;
        padding: 14px 30px;
    }

    .feature-card {
        padding: 20px;
    }
}