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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #0078d4 0%, #004578 100%);
    min-height: 100vh;
    padding: 20px;
    color: #333;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

.header {
    text-align: center;
    color: white;
    margin-bottom: 40px;
    padding: 40px 0 20px 0;
}

.logo-section {
    margin-bottom: 20px;
}

.logo-section i {
    font-size: 4rem;
    color: #ffc107;
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.3));
}

.header h1 {
    font-size: 3rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    font-weight: 700;
}

.subtitle {
    font-size: 1.3rem;
    opacity: 0.95;
    margin-bottom: 5px;
}

.event-date {
    font-size: 1rem;
    opacity: 0.85;
    font-style: italic;
}

/* Info Sections */
.info-section {
    background: white;
    border-radius: 15px;
    padding: 35px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    margin-bottom: 30px;
}

.info-section h2 {
    color: #0078d4;
    margin-bottom: 20px;
    font-size: 1.8rem;
    display: flex;
    align-items: center;
    gap: 12px;
}

.info-section h2 i {
    font-size: 1.6rem;
}

/* Brief Overview Section */
.brief-overview {
    border-left: 5px solid #0078d4;
}

.brief-description {
    line-height: 1.8;
    color: #555;
    font-size: 1.05rem;
    margin-bottom: 25px;
}

.brief-description strong {
    color: #0078d4;
}

.key-points {
    margin-top: 20px;
}

.key-points h3 {
    color: #333;
    font-size: 1.2rem;
    margin-bottom: 15px;
}

.key-points ul {
    list-style: none;
    padding: 0;
}

.key-points ul li {
    padding: 12px 0;
    color: #555;
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 1px solid #e9ecef;
}

.key-points ul li:last-child {
    border-bottom: none;
}

.key-points ul li i {
    color: #28a745;
    font-size: 1.1rem;
}

.repo-link {
    margin-top: 25px;
    text-align: center;
}

.btn-repo {
    display: inline-block;
    padding: 15px 30px;
    background: linear-gradient(135deg, #24292e 0%, #000000 100%);
    color: white;
    text-decoration: none;
    border-radius: 10px;
    font-weight: 600;
    font-size: 1.05rem;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

.btn-repo:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(36, 41, 46, 0.4);
}

.btn-repo i {
    font-size: 1.3rem;
}

/* Verification Card */
.verification-card {
    background: white;
    border-radius: 15px;
    padding: 40px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    margin-bottom: 30px;
    border-left: 5px solid #ffc107;
}

.verification-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 10px;
}

.verification-header i {
    font-size: 2rem;
    color: #ffc107;
}

.verification-card h2 {
    color: #0078d4;
    font-size: 2rem;
    margin: 0;
}

.instruction {
    color: #666;
    margin-bottom: 30px;
    font-size: 1.05rem;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 10px;
    font-weight: 600;
    color: #444;
    font-size: 1rem;
}

.form-group label i {
    color: #0078d4;
}

.form-group input {
    width: 100%;
    padding: 15px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-group input:focus {
    outline: none;
    border-color: #0078d4;
    box-shadow: 0 0 0 3px rgba(0, 120, 212, 0.1);
}

.verify-btn {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, #0078d4 0%, #005a9e 100%);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.verify-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(0, 120, 212, 0.4);
}

.verify-btn:active {
    transform: translateY(0);
}

.result {
    margin-top: 30px;
    padding: 20px;
    border-radius: 10px;
    animation: slideIn 0.4s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.result.hidden {
    display: none;
}

.result.success {
    background: #d4edda;
    border: 2px solid #28a745;
    color: #155724;
}

.result.error {
    background: #f8d7da;
    border: 2px solid #dc3545;
    color: #721c24;
}

.result h3 {
    margin-bottom: 10px;
    font-size: 1.3rem;
}

.result p {
    margin: 5px 0;
}

.result-icon {
    font-size: 3rem;
    margin-bottom: 10px;
    display: block;
}

/* Verified Certificate Info */
.verified-info {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 10px;
    margin: 20px 0;
}

.verified-info p {
    margin: 10px 0;
    font-size: 1.05rem;
}

.badge-valid {
    display: inline-block;
    padding: 5px 15px;
    background: #28a745;
    color: white;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
}

/* Session Details in Result */
.session-details {
    margin-top: 30px;
    padding-top: 30px;
    border-top: 2px solid #e9ecef;
}

.session-details h3 {
    color: #0078d4;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.session-intro {
    background: #e7f3ff;
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 25px;
    line-height: 1.7;
    color: #004578;
}

.topics-learned {
    margin-top: 20px;
}

.topics-learned h4 {
    color: #333;
    margin-bottom: 20px;
    font-size: 1.1rem;
}

.topic-item {
    display: flex;
    gap: 15px;
    padding: 15px;
    margin-bottom: 15px;
    background: #f8f9fa;
    border-radius: 8px;
    border-left: 4px solid #0078d4;
}

.topic-item i {
    font-size: 1.5rem;
    color: #0078d4;
    margin-top: 5px;
}

.topic-item strong {
    display: block;
    color: #333;
    margin-bottom: 5px;
    font-size: 1.05rem;
}

.topic-item p {
    color: #666;
    font-size: 0.95rem;
    line-height: 1.6;
    margin: 5px 0 0 0;
}

.resources-box {
    margin-top: 25px;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 10px;
}

.resources-box h4 {
    color: #333;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.resource-link {
    display: inline-block;
    padding: 10px 20px;
    background: #0078d4;
    color: white;
    text-decoration: none;
    border-radius: 6px;
    margin-right: 10px;
    margin-bottom: 10px;
    font-size: 0.95rem;
    transition: background 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.resource-link:hover {
    background: #005a9e;
}

.download-btn {
    display: inline-block;
    margin-top: 20px;
    padding: 12px 30px;
    background: linear-gradient(135deg, #0078d4 0%, #005a9e 100%);
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 120, 212, 0.4);
}

/* Footer */
footer {
    text-align: center;
    color: white;
    padding: 30px 0;
    opacity: 0.95;
}

footer p {
    margin: 5px 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header h1 {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 1.1rem;
    }
    
    .verification-card {
        padding: 25px;
    }
    
    .verification-card h2 {
        font-size: 1.5rem;
    }
    
    .info-section {
        padding: 25px;
    }
    
    .topic-item {
        flex-direction: column;
        gap: 10px;
    }
    
    .topic-item i {
        font-size: 2rem;
    }
    
    .resource-link {
        display: block;
        margin-bottom: 10px;
    }
}

@media (max-width: 480px) {
    body {
        padding: 10px;
    }
    
    .header {
        padding: 20px 0;
    }
    
    .header h1 {
        font-size: 1.6rem;
    }
    
    .logo-section i {
        font-size: 3rem;
    }
    
    .verified-info {
        padding: 15px;
    }
}