/* Reset và base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 50px 20px;
    text-align: center;
    color: white;
}

.container h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.container p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    opacity: 0.9;
}

.open-popup-btn {
    background: linear-gradient(45deg, #FF6B6B, #FF8E53);
    color: white;
    border: none;
    padding: 15px 40px;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(255, 107, 107, 0.4);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.open-popup-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 107, 107, 0.6);
}

/* Popup Overlay */
.popup-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.popup-overlay.active {
    opacity: 1;
    visibility: visible;
}

.popup-container {
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    transform: scale(0.7) translateY(50px);
    transition: all 0.3s ease;
    position: relative;
}

.popup-overlay.active .popup-container {
    transform: scale(1) translateY(0);
}

.popup-header {
    background: linear-gradient(135deg, #ffe7a8  0%, #eeaf0f 100%);
    color: white;
    padding: 25px 30px;
    border-radius: 20px 20px 0 0;
    position: relative;
    text-align: center;
}

.popup-header h2 {
    font-size: 1.8rem;
    font-weight: 600;
    margin: 0;
}

.close-btn {
    position: absolute;
    top: 25px;
    right: 25px;
    font-size: 2rem;
    cursor: pointer;
    color: white;
    transition: all 0.3s ease;
    width: 35px;
    height: 35px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}


/* Form Styles */
.registration-form {
    padding: 30px;
}

.form-group {
    margin-bottom: 20px;
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #333;
    font-size: 0.95rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e1e5e9;
    border-radius: 10px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: #f8f9fa;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #667eea;
    background: white;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    transform: translateY(-1px);
}

.form-group textarea {
    resize: vertical;
    min-height: 80px;
}

.submit-btn {
    width: 100%;
    background: linear-gradient(45deg, #ffe7a8 , #eeaf0f);
    color: white;
    border: none;
    padding: 15px;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
}

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

/* Success Message */
.success-message {
    display: none;
    padding: 30px;
    text-align: center;
    animation: slideInFromBottom 0.5s ease;
}

.success-message.show {
    display: block;
}

.success-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(45deg, #4CAF50, #45a049);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    font-weight: bold;
    margin: 0 auto 20px;
    animation: bounce 0.6s ease;
}

.success-message h3 {
    color: #333;
    font-size: 1.5rem;
    margin-bottom: 15px;
}

.success-message p {
    color: #666;
    font-size: 1rem;
    margin-bottom: 25px;
    line-height: 1.5;
}

.ok-btn {
    background: linear-gradient(45deg, #4CAF50, #45a049);
    color: white;
    border: none;
    padding: 12px 30px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.ok-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(76, 175, 80, 0.4);
}

/* Animations */
@keyframes slideInFromBottom {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(-10px);
    }
    60% {
        transform: translateY(-5px);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .popup-container {
        width: 95%;
        margin: 10px;
    }
    
    .popup-header {
        padding: 20px;
    }
    
    .popup-header h2 {
        font-size: 1.5rem;
    }
    
    .registration-form {
        padding: 20px;
    }
    
    .container h1 {
        font-size: 2rem;
    }
    
    .open-popup-btn {
        padding: 12px 30px;
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .form-group {
        margin-bottom: 15px;
    }
    
    .form-group input,
    .form-group textarea {
        padding: 10px 12px;
    }
    
    .submit-btn {
        padding: 12px;
        font-size: 1rem;
    }
}

/* Custom Scrollbar */
.popup-container::-webkit-scrollbar {
    width: 6px;
}

.popup-container::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 10px;
}

.popup-container::-webkit-scrollbar-thumb {
    background: linear-gradient(45deg, #667eea, #764ba2);
    border-radius: 10px;
}

.popup-container::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(45deg, #5a67d8, #6b46c1);
}