/* Modern Light Theme with Professional Colors */
:root {
    --primary-blue: #0066cc;
    --secondary-blue: #003366;
    --accent-green: #28a745;
    --light-bg: #ffffff;
    --light-gray-bg: #f8f9fa;
    --medium-gray-bg: #e9ecef;
    --card-bg: rgba(255, 255, 255, 0.95);
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --text-muted: #adb5bd;
    --gradient-primary: linear-gradient(135deg, #0066cc 0%, #003366 100%);
    --gradient-secondary: linear-gradient(135deg, #003366 0%, #28a745 100%);
    --gradient-accent: linear-gradient(135deg, #28a745 0%, #0066cc 100%);
    --shadow-light: 0 2px 10px rgba(0, 102, 204, 0.1);
    --shadow-medium: 0 4px 20px rgba(0, 102, 204, 0.15);
    --shadow-heavy: 0 8px 30px rgba(0, 102, 204, 0.2);
    --border-radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Roboto', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--light-bg);
    min-height: 100vh;
}

/* Advanced Header Styles */
.ato-header {
    background: var(--gradient-primary);
    color: #ffffff;
    padding: 1rem 0;
    box-shadow: var(--shadow-medium);
    position: sticky;
    top: 0;
    z-index: 1000;
    overflow: hidden;
    width: 100%;
}

.ato-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, transparent 30%, rgba(255,255,255,0.1) 50%, transparent 70%);
    animation: shimmer 3s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.ato-logo {
    display: flex;
    align-items: center;
    gap: 15px;
}

.ato-logo-link {
    display: flex;
    align-items: center;
    gap: 15px;
    text-decoration: none;
    color: inherit;
}

.ato-logo-img {
    height: 100px;
    width: auto;
    object-fit: contain;
}

/* Logo styling */
.ato-logo-img {
    height: 100px;
    width: auto;
    object-fit: contain;
}

.ato-title-container {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    line-height: 1.2;
}

.ato-government {
    font-size: 1.0rem;
    font-weight: 600;
    color: #e3f2fd;
    opacity: 0.9;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    border-bottom: 1px solid rgba(255, 255, 255, 0.6);
    padding-bottom: 4px;
    margin-bottom: 4px;
}

.ato-title {
    font-size: 1.0rem;
    font-weight: 600;
    color: #ffffff;
    margin-top: 2px;
}

.main-nav ul {
    display: flex;
    list-style: none;
    gap: 30px;
}

.main-nav a {
    color: #ffffff;
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.main-nav a:hover {
    color: #e3f2fd;
    background: rgba(0, 102, 204, 0.2);
    border-radius: 6px;
    padding: 8px 12px;
    margin: -8px -12px;
    transition: all 0.3s ease;
}

/* Desktop Menu Modal */
.desktop-menu-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 10000;
    backdrop-filter: blur(5px);
}

.desktop-menu-modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.desktop-menu-content {
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    padding: 40px;
    max-width: 500px;
    width: 90%;
    position: relative;
    animation: modalSlideIn 0.3s ease-out;
    border: 2px solid rgba(0, 102, 204, 0.1);
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: scale(0.9) translateY(-20px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.desktop-menu-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-blue), var(--accent-green), var(--secondary-blue));
    border-radius: 20px 20px 0 0;
}

.desktop-menu-header {
    text-align: center;
    margin-bottom: 30px;
    position: relative;
}

.desktop-menu-header h3 {
    color: var(--primary-blue);
    font-size: 1.8rem;
    font-weight: 700;
    margin: 0;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.desktop-menu-close {
    position: absolute;
    top: -10px;
    right: -10px;
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #dc3545, #c82333);
    border: none;
    border-radius: 50%;
    color: white;
    font-size: 1.2rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(220, 53, 69, 0.3);
}

.desktop-menu-close:hover {
    transform: scale(1.1) rotate(90deg);
    box-shadow: 0 6px 20px rgba(220, 53, 69, 0.4);
}

.desktop-menu-nav {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.desktop-menu-nav a {
    display: block;
    padding: 20px 25px;
    background: linear-gradient(135deg, rgba(0, 102, 204, 0.1), rgba(0, 51, 102, 0.05));
    color: var(--primary-blue);
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    border-radius: 12px;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
    text-align: center;
}

.desktop-menu-nav a::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 102, 204, 0.2), transparent);
    transition: left 0.5s ease;
}

.desktop-menu-nav a:hover::before {
    left: 100%;
}

.desktop-menu-nav a:hover {
    background: linear-gradient(135deg, rgba(0, 102, 204, 0.15), rgba(0, 51, 102, 0.1));
    border-color: rgba(0, 102, 204, 0.3);
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 102, 204, 0.2);
    color: var(--secondary-blue);
}

.desktop-menu-nav a:active {
    transform: translateY(-1px);
}

/* Desktop Menu Trigger Button */
.desktop-menu-trigger {
    display: none;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.2), rgba(255, 255, 255, 0.1));
    border: 2px solid rgba(255, 255, 255, 0.3);
    color: #ffffff;
    padding: 12px 20px;
    border-radius: 25px;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    text-transform: uppercase;
    letter-spacing: 1px;
    position: relative;
    overflow: hidden;
}

.desktop-menu-trigger::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.5s ease;
}

.desktop-menu-trigger:hover::before {
    left: 100%;
}

.desktop-menu-trigger:hover {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.3), rgba(255, 255, 255, 0.2));
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
}

.desktop-menu-trigger:active {
    transform: translateY(0);
}

/* Show desktop menu trigger on desktop */
@media (min-width: 769px) {
    .desktop-menu-trigger {
        display: inline-block;
    }

    .main-nav {
        display: none !important;
    }
}

/* Welcome Section */
.welcome-section {
    background: var(--light-gray-bg);
    padding: 80px 0;
    text-align: center;
}

.video-container {
    max-width: 800px;
    margin: 0 auto 40px;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-medium);
}

.welcome-video {
    width: 100%;
    height: auto;
}

.welcome-content h1 {
    font-size: 3rem;
    color: var(--primary-blue);
    margin-bottom: 20px;
    font-weight: 700;
}

.welcome-content p {
    font-size: 1.3rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto 30px;
}

.cta-btn {
    display: inline-block;
    background: var(--gradient-primary);
    color: #ffffff;
    padding: 18px 40px;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 700;
    font-size: 1.2rem;
    transition: var(--transition);
    box-shadow: var(--shadow-medium);
    border: none;
}

.cta-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-heavy);
    background: var(--gradient-secondary);
}

/* Authentication Section */
.auth-section {
    padding: 80px 0;
    background: var(--light-bg);
}

.auth-container {
    max-width: 600px;
    margin: 0 auto;
    background: var(--card-bg);
    padding: 50px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-medium);
    border: 1px solid var(--medium-gray-bg);
}

.auth-container h2 {
    text-align: center;
    color: var(--primary-blue);
    margin-bottom: 15px;
    font-size: 2.2rem;
    font-weight: 700;
}

.auth-description {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 40px;
    font-size: 1.1rem;
    line-height: 1.6;
}

.auth-form {
    margin-bottom: 40px;
}

.auth-form .form-group {
    margin-bottom: 20px;
}

.auth-form label {
    display: block;
    margin-bottom: 6px;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1rem;
}

.auth-form input,
.auth-form textarea {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid var(--medium-gray-bg);
    border-radius: 8px;
    font-size: 1rem;
    transition: var(--transition);
    background: #ffffff;
}

.auth-form input:focus,
.auth-form textarea:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

/* Phone Input Container */
.phone-input-container {
    display: flex;
    gap: 10px;
    align-items: stretch;
}

.country-code-select {
    flex: 0 0 180px;
    padding: 12px 15px;
    border: 2px solid var(--medium-gray-bg);
    border-radius: 8px;
    font-size: 1rem;
    background: #ffffff;
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
    min-width: 0;
}

.country-code-select:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.country-code-select option {
    padding: 8px;
    background: #ffffff;
    color: var(--text-primary);
}

#loginPhone {
    flex: 1;
    min-width: 0;
}

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

.user-info {
    background: rgba(40, 167, 69, 0.1);
    border: 1px solid rgba(40, 167, 69, 0.2);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 30px;
}

.user-info h3 {
    color: var(--accent-green);
    margin-bottom: 10px;
    font-size: 1.3rem;
}

.user-info p {
    margin: 0;
    color: var(--text-primary);
    line-height: 1.6;
}

/* Calculator Section */
.calculator-section {
    padding: 80px 0;
    background: var(--light-bg);
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 20px;
}

.calculator-section h2 {
    text-align: center;
    color: var(--primary-blue);
    margin-bottom: 50px;
    font-size: 2.5rem;
    font-weight: 700;
}

.calculator-form {
    background: var(--card-bg);
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-medium);
    border: 1px solid var(--medium-gray-bg);
    max-width: 600px;
    margin: 0 auto;
}

.calculator-form::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    border-radius: var(--border-radius) var(--border-radius) 0 0;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1.1rem;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 15px;
    background: var(--light-bg);
    border: 2px solid var(--medium-gray-bg);
    border-radius: 8px;
    font-size: 1.1rem;
    color: var(--text-primary);
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

/* Crypto Select Component */
.crypto-select-container {
    position: relative;
}

#cryptoSearch {
    width: 100%;
    padding: 15px;
    background: var(--light-bg);
    border: 2px solid var(--medium-gray-bg);
    border-radius: 8px;
    font-size: 1.1rem;
    color: var(--text-primary);
    transition: var(--transition);
}

#cryptoSearch:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.crypto-dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--light-bg);
    border: 2px solid var(--medium-gray-bg);
    border-top: none;
    border-radius: 0 0 8px 8px;
    max-height: 300px;
    overflow-y: auto;
    z-index: 1000;
    box-shadow: var(--shadow-medium);
    display: none;
}

.crypto-dropdown.show {
    display: block;
}

.crypto-option {
    display: flex;
    align-items: center;
    padding: 12px 15px;
    cursor: pointer;
    transition: var(--transition);
    border-bottom: 1px solid var(--medium-gray-bg);
}

.crypto-option:last-child {
    border-bottom: none;
}

.crypto-option:hover,
.crypto-option.selected {
    background: rgba(0, 102, 204, 0.1);
}

.crypto-icon {
    width: 24px;
    height: 24px;
    margin-right: 12px;
    border-radius: 50%;
}

.crypto-option span {
    font-weight: 500;
    color: var(--text-primary);
}

.calculate-btn {
    background: var(--gradient-primary);
    color: #ffffff;
    border: none;
    padding: 18px 40px;
    border-radius: var(--border-radius);
    font-size: 1.2rem;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
    width: 100%;
    box-shadow: var(--shadow-medium);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.calculate-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-heavy);
    background: var(--gradient-secondary);
}

/* Results Container */
.results-container {
    margin-top: 40px;
    background: var(--card-bg);
    padding: 40px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-medium);
    border: 1px solid var(--medium-gray-bg);
}

.results-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-accent);
    border-radius: var(--border-radius) var(--border-radius) 0 0;
}

.results-container h3 {
    color: var(--accent-green);
    margin-bottom: 25px;
    text-align: center;
    font-size: 1.8rem;
    font-weight: 700;
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
    border-bottom: 1px solid var(--medium-gray-bg);
    transition: var(--transition);
}

.result-item:hover {
    background: rgba(40, 167, 69, 0.05);
    border-radius: 8px;
    padding-left: 10px;
    padding-right: 10px;
}

.result-item.total {
    border-bottom: none;
    border-top: 2px solid var(--accent-green);
    padding-top: 25px;
    margin-top: 15px;
    font-weight: bold;
    font-size: 1.3rem;
    color: var(--accent-green);
}

.result-label {
    font-weight: 600;
    color: var(--text-secondary);
}

.result-value {
    font-weight: 700;
    color: var(--accent-green);
}

/* Payment Section */
.payment-section {
    padding: 80px 0;
    background: var(--light-gray-bg);
}

.payment-section h2 {
    text-align: center;
    color: var(--accent-green);
    margin-bottom: 50px;
    font-size: 2.5rem;
    font-weight: 700;
}

.payment-form {
    background: var(--card-bg);
    padding: 50px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-medium);
    border: 1px solid var(--medium-gray-bg);
    text-align: center;
}

.pay-btn {
    background: var(--gradient-accent);
    color: #ffffff;
    border: none;
    padding: 18px 40px;
    border-radius: var(--border-radius);
    font-size: 1.2rem;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 30px;
    box-shadow: var(--shadow-medium);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.pay-btn:hover:not(:disabled) {
    transform: translateY(-3px);
    box-shadow: var(--shadow-heavy);
    background: var(--gradient-primary);
}

.pay-btn:disabled {
    background: var(--text-muted);
    cursor: not-allowed;
    box-shadow: none;
}

.payment-status {
    margin-top: 25px;
    padding: 20px;
    border-radius: var(--border-radius);
    display: none;
    font-weight: 600;
}

.payment-status.success {
    background: rgba(40, 167, 69, 0.1);
    color: var(--accent-green);
    border: 1px solid var(--accent-green);
}

.payment-status.error {
    background: rgba(220, 53, 69, 0.1);
    color: #dc3545;
    border: 1px solid #dc3545;
}

/* Footer */
.ato-footer {
    background: var(--secondary-blue);
    color: #ffffff;
    padding: 60px 0 30px;
    margin-top: 80px;
    text-align: center;
}

.footer-logo {
    margin-bottom: 30px;
}

.footer-logo-img {
    height: 70px;
    width: auto;
    object-fit: contain;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 40px;
}

.footer-section h4 {
    margin-bottom: 20px;
    font-size: 1.3rem;
    color: #ffffff;
    font-weight: 700;
}

.footer-section p,
.footer-section ul {
    margin-bottom: 15px;
    color: #e3f2fd;
}

.footer-section ul {
    list-style: none;
}

.footer-section a {
    color: #e3f2fd;
    text-decoration: none;
    transition: var(--transition);
    font-weight: 500;
}

.footer-section a:hover {
    color: #ffffff;
}

/* Advanced Modal System */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgb(0, 51, 102);
    animation: fadeIn 0.3s ease-out;
}

.modal-content {
    background: linear-gradient(145deg, var(--white) 0%, var(--light-gray) 100%);
    margin: 2% auto;
    padding: 0;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-heavy);
    width: 90%;
    max-width: 700px;
    max-height: 90vh;
    position: relative;
    animation: slideIn 0.3s ease-out;
    border: 1px solid rgba(0, 51, 102, 0.1);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

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

@keyframes slideIn {
    from {
        transform: translateY(-50px) scale(0.9);
        opacity: 0;
    }
    to {
        transform: translateY(0) scale(1);
        opacity: 1;
    }
}

.modal-header {
    background: var(--ato-gradient);
    color: var(--white);
    padding: 20px 30px;
    position: relative;
    overflow: hidden;
}

.modal-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, transparent 30%, rgba(255,255,255,0.1) 50%, transparent 70%);
    animation: shimmer 2s infinite;
}

.modal-header h2 {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 600;
    position: relative;
    z-index: 1;
    color: #ffffff;
    text-align: center;
}

.modal-body {
    padding: 30px;
    text-align: center;
    color: #ffffff;
    flex: 1;
    overflow-y: auto;
    max-height: calc(90vh - 140px); /* Account for header and footer */
}

.modal-icon {
    font-size: 4rem;
    margin-bottom: 20px;
    display: block;
}

.modal-message {
    font-size: 1.1rem;
    margin-bottom: 20px;
    line-height: 1.6;
    color: #ffffff;
    text-align: center;
}

.modal-details {
    background: rgba(255, 255, 255, 0.1);
    padding: 15px;
    border-radius: 8px;
    margin: 20px 0;
    text-align: center;
    color: #ffffff;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.modal-details p {
    margin: 5px 0;
    font-size: 0.95rem;
    text-align: center;
}

.modal-footer {
    padding: 20px 30px 30px;
    background: rgba(255, 255, 255, 0.1);
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    text-align: center;
}

.modal-btn {
    padding: 12px 24px;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    margin: 0 5px;
    min-width: 100px;
    background: #ffffff;
    color: #000000;
}

.modal-btn-primary {
    background: #ffffff;
    color: #000000;
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.3);
}

.modal-btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.5);
    background: #f0f0f0;
}

.modal-btn-secondary {
    background: var(--medium-gray);
    color: var(--dark-gray);
}

.modal-btn-secondary:hover {
    background: var(--dark-gray);
    color: var(--white);
}

.modal-btn-success {
    background: var(--success-gradient);
    color: var(--white);
    box-shadow: var(--shadow-light);
}

.modal-btn-success:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.modal-btn-error {
    background: var(--error-gradient);
    color: var(--white);
    box-shadow: var(--shadow-light);
}

.modal-btn-error:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.close-modal {
    position: absolute;
    top: 15px;
    right: 20px;
    font-size: 2rem;
    font-weight: bold;
    color: var(--white);
    cursor: pointer;
    z-index: 2;
    transition: var(--transition);
}

.close-modal:hover {
    transform: scale(1.1);
}

/* Success Modal Styles */
.modal-success .modal-icon {
    color: var(--success-green);
}

.modal-success .modal-header {
    background: var(--success-gradient);
}

/* Error Modal Styles */
.modal-error .modal-icon {
    color: var(--error-red);
}

.modal-error .modal-header {
    background: var(--error-gradient);
}

/* Info Modal Styles */
.modal-info .modal-icon {
    color: var(--info-blue);
}

.modal-info .modal-header {
    background: linear-gradient(135deg, var(--info-blue) 0%, #5bc0de 100%);
}

/* Warning Modal Styles */
.modal-warning .modal-icon {
    color: var(--warning-orange);
}

.modal-warning .modal-header {
    background: linear-gradient(135deg, var(--warning-orange) 0%, #f39c12 100%);
}

/* Loading Animation */
.loading-spinner {
    border: 4px solid var(--light-gray);
    border-top: 4px solid var(--ato-blue);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 20px auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Crypto Payment Modal Styles */
.crypto-payment-modal {
    max-width: 100%;
}

.crypto-selector {
    margin-bottom: 25px;
    padding: 20px;
    background: linear-gradient(135deg, rgba(26, 35, 126, 0.1), rgba(63, 81, 181, 0.1));
    border-radius: 12px;
    border: 2px solid rgba(63, 81, 181, 0.3);
    box-shadow: 0 4px 15px rgba(26, 35, 126, 0.2);
}

/* Advanced Cryptocurrency Dropdown Styling */
.crypto-selector select {
    width: 100%;
    padding: 15px 20px;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.95), rgba(248, 249, 250, 0.95));
    border: 2px solid rgba(63, 81, 181, 0.4);
    border-radius: 12px;
    color: #1a237e;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(63, 81, 181, 0.2);
    position: relative;
    appearance: none;
    background-image:
        linear-gradient(45deg, transparent 50%, rgba(63, 81, 181, 0.8) 50%),
        linear-gradient(135deg, rgba(63, 81, 181, 0.8) 50%, transparent 50%);
    background-position:
        calc(100% - 20px) calc(1em + 2px),
        calc(100% - 15px) calc(1em + 2px);
    background-size:
        5px 5px,
        5px 5px;
    background-repeat: no-repeat;
    padding-right: 40px;
}

.crypto-selector select:focus {
    outline: none;
    border-color: #1a237e;
    box-shadow: 0 0 0 3px rgba(26, 35, 126, 0.3), 0 6px 20px rgba(63, 81, 181, 0.4);
    transform: translateY(-2px);
    background: linear-gradient(135deg, rgba(255, 255, 255, 1), rgba(248, 249, 250, 1));
}

.crypto-selector select:hover {
    border-color: #3949ab;
    box-shadow: 0 6px 20px rgba(63, 81, 181, 0.3);
    transform: translateY(-1px);
}

.crypto-selector select option {
    padding: 12px;
    background: linear-gradient(135deg, #ffffff, #f8f9fa);
    color: #1a237e;
    font-weight: 500;
    border-bottom: 1px solid rgba(63, 81, 181, 0.2);
}

.crypto-selector select option:first-child {
    background: linear-gradient(135deg, #e3f2fd, #bbdefb);
    color: #0d47a1;
    font-weight: 700;
    border-bottom: 2px solid #1976d2;
}

.crypto-selector select option:hover {
    background: linear-gradient(135deg, #e8eaf6, #c5cae9);
}

/* Custom dropdown arrow */
.crypto-selector::after {
    content: '▼';
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    color: #3949ab;
    font-size: 1.2rem;
    pointer-events: none;
    transition: all 0.3s ease;
}

.crypto-selector select:focus + .crypto-selector::after {
    color: #1a237e;
    transform: translateY(-50%) rotate(180deg);
}

/* Enhanced label styling */
.crypto-selector label {
    display: block;
    margin-bottom: 12px;
    color: #ffffff;
    font-weight: 700;
    font-size: 1.2rem;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    position: relative;
}

.crypto-selector label::before {
    content: '🚀';
    margin-right: 8px;
    font-size: 1.1rem;
    vertical-align: middle;
}

/* Animation for dropdown */
@keyframes dropdownGlow {
    0%, 100% {
        box-shadow: 0 4px 15px rgba(63, 81, 181, 0.2);
    }
    50% {
        box-shadow: 0 4px 15px rgba(63, 81, 181, 0.4), 0 0 20px rgba(63, 81, 181, 0.2);
    }
}

.crypto-selector select:focus {
    animation: dropdownGlow 2s ease-in-out infinite;
}

.crypto-payment-display {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 25px;
    margin-bottom: 20px;
    transition: all 0.3s ease;
}

.crypto-payment-display:hover {
    border-color: rgba(255, 255, 255, 0.3);
    background: rgba(255, 255, 255, 0.08);
}

.crypto-payment-option {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 25px;
    margin-bottom: 20px;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.crypto-payment-option::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-blue), var(--secondary-blue), var(--accent-green));
    border-radius: 16px 16px 0 0;
}

.crypto-payment-option:hover {
    border-color: rgba(255, 255, 255, 0.3);
    background: rgba(255, 255, 255, 0.08);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

.crypto-payment-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 15px;
}

.crypto-payment-header h4 {
    margin: 0;
    color: #ffffff;
    font-size: 1.3rem;
    font-weight: 700;
    text-align: center;
    flex: 1;
}

.crypto-qr {
    text-align: center;
    flex-shrink: 0;
}

.qr-code {
    width: 120px;
    height: 120px;
    border-radius: 12px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
}

.qr-code:hover {
    transform: scale(1.05);
    border-color: rgba(255, 255, 255, 0.5);
}

.crypto-payment-details {
    text-align: center;
}

.crypto-payment-details p {
    margin: 12px 0;
    color: #ffffff;
    font-size: 1rem;
    line-height: 1.5;
}

.crypto-payment-details p strong {
    color: #e3f2fd;
    font-weight: 600;
}

.wallet-address-container {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 15px 0;
    padding: 15px;
    background: rgba(0, 0, 0, 0.4);
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    position: relative;
}

.wallet-address-container::before {
    content: '📋';
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.2rem;
    opacity: 0.7;
}

.wallet-address {
    flex: 1;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    color: #ffffff;
    word-break: break-all;
    background: transparent;
    border: none;
    padding: 0 0 0 25px;
    text-align: center;
    font-weight: 500;
}

.copy-btn {
    background: linear-gradient(135deg, var(--primary-blue), var(--secondary-blue));
    border: 2px solid rgba(255, 255, 255, 0.3);
    color: #ffffff;
    padding: 10px 16px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 6px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: 0 4px 15px rgba(26, 35, 126, 0.3);
}

.copy-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(26, 35, 126, 0.4);
    background: linear-gradient(135deg, var(--secondary-blue), var(--primary-blue));
}

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

.payment-instructions {
    background: rgba(255, 255, 255, 0.08);
    padding: 20px;
    border-radius: 12px;
    margin-top: 20px;
    border-left: 4px solid var(--accent-green);
    text-align: left;
}

.payment-instructions p {
    margin: 8px 0;
    font-size: 0.95rem;
    color: rgba(255, 255, 255, 0.95);
    line-height: 1.6;
}

.payment-instructions p:first-child {
    margin-top: 0;
}

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

.payment-notice {
    background: linear-gradient(135deg, rgba(255, 152, 0, 0.1), rgba(255, 152, 0, 0.05));
    border: 2px solid rgba(255, 152, 0, 0.3);
    border-radius: 12px;
    padding: 20px;
    margin-top: 25px;
    position: relative;
}

.payment-notice::before {
    content: '⚠️';
    position: absolute;
    left: 20px;
    top: 20px;
    font-size: 1.5rem;
}

.payment-notice p {
    margin: 8px 0 8px 40px;
    color: #ffcc80;
    font-size: 0.95rem;
    font-weight: 500;
    line-height: 1.6;
}

.verification-status {
    text-align: center;
    color: #ffffff;
    padding: 20px;
}

.verification-status p {
    margin: 15px 0;
    color: rgba(255, 255, 255, 0.9);
    font-size: 1rem;
    line-height: 1.6;
}

/* Countdown Timer Styles */
.verification-countdown {
    text-align: center;
    padding: 20px 0;
}

.countdown-circle {
    position: relative;
    width: 200px;
    height: 200px;
    margin: 0 auto 30px;
    border-radius: 50%;
    background: conic-gradient(#e0e0e0 0deg, #e0e0e0 360deg);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.countdown-progress {
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: conic-gradient(#4caf50 0deg, #e0e0e0 0deg);
    transition: background 1s linear;
}

.countdown-text {
    position: relative;
    z-index: 2;
    text-align: center;
}

.countdown-time {
    font-size: 2.5rem;
    font-weight: 700;
    color: #1a237e;
    margin-bottom: 5px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.countdown-label {
    font-size: 0.9rem;
    color: #666;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.verification-details {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    padding: 20px;
    margin-top: 20px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.verification-details p {
    margin: 10px 0;
    color: #ffffff;
    font-size: 0.95rem;
    line-height: 1.6;
}

.verification-details p strong {
    color: #e3f2fd;
    font-weight: 600;
}

.verification-steps {
    margin-top: 15px;
}

.verification-list {
    list-style: none;
    padding: 0;
    margin: 10px 0;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    padding: 15px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.verification-list li {
    margin: 8px 0;
    color: rgba(255, 255, 255, 0.9);
    font-size: 0.9rem;
    line-height: 1.5;
    position: relative;
    padding-left: 20px;
}

.verification-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #4caf50;
}

.verification-list li:nth-child(3)::before {
    background: #ff9800;
    animation: pulse 2s infinite;
}

.verification-list li:nth-child(4)::before,
.verification-list li:nth-child(5)::before {
    background: #9e9e9e;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.verification-note {
    background: rgba(255, 152, 0, 0.1);
    border: 1px solid rgba(255, 152, 0, 0.3);
    border-radius: 8px;
    padding: 15px;
    margin-top: 15px;
    color: #ffcc80 !important;
    font-weight: 500;
}

.verification-note::before {
    content: '⏳';
    margin-right: 8px;
    font-size: 1.2rem;
}

/* Pulse animation for countdown */
@keyframes countdownPulse {
    0%, 100% {
        transform: scale(1);
        box-shadow: 0 4px 20px rgba(76, 175, 80, 0.3);
    }
    50% {
        transform: scale(1.05);
        box-shadow: 0 4px 30px rgba(76, 175, 80, 0.5);
    }
}

.countdown-circle {
    animation: countdownPulse 2s ease-in-out infinite;
}

/* Mobile responsive for countdown */
@media (max-width: 768px) {
    .countdown-circle {
        width: 150px;
        height: 150px;
    }

    .countdown-time {
        font-size: 2rem;
    }

    .countdown-label {
        font-size: 0.8rem;
    }

    .verification-details {
        padding: 15px;
        margin-top: 15px;
    }

    .verification-details p {
        font-size: 0.9rem;
    }
}

@keyframes fadeInOut {
    0%, 100% { opacity: 0; transform: translateY(-20px); }
    10%, 90% { opacity: 1; transform: translateY(0); }
}

/* Advanced Button Transition Styles */
.fade-out-button {
    animation: buttonFadeOut 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
    pointer-events: none;
}

@keyframes buttonFadeOut {
    0% {
        opacity: 1;
        transform: scale(1) translateY(0);
        filter: blur(0px);
    }
    50% {
        opacity: 0.8;
        transform: scale(1.05) translateY(-2px);
        filter: blur(0.5px);
    }
    100% {
        opacity: 0;
        transform: scale(0.95) translateY(-10px);
        filter: blur(2px);
    }
}

.button-completed {
    position: relative;
    overflow: hidden;
}

.button-completed::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: radial-gradient(circle, rgba(76, 175, 80, 0.8) 0%, rgba(76, 175, 80, 0.4) 50%, transparent 70%);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    animation: buttonSuccessPulse 0.8s ease-out forwards;
    z-index: 1;
}

.button-completed::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0);
    color: #4caf50;
    font-size: 1.2em;
    font-weight: bold;
    animation: checkmarkAppear 0.6s ease-out 0.3s forwards;
    z-index: 2;
}

@keyframes buttonSuccessPulse {
    0% {
        width: 0;
        height: 0;
        opacity: 1;
    }
    50% {
        width: 200px;
        height: 200px;
        opacity: 0.7;
    }
    100% {
        width: 300px;
        height: 300px;
        opacity: 0;
    }
}

@keyframes checkmarkAppear {
    0% {
        transform: translate(-50%, -50%) scale(0) rotate(-180deg);
        opacity: 0;
    }
    50% {
        transform: translate(-50%, -50%) scale(1.2) rotate(-90deg);
        opacity: 1;
    }
    100% {
        transform: translate(-50%, -50%) scale(1) rotate(0deg);
        opacity: 1;
    }
}

/* Enhanced button hover effects */
.cta-btn, .calculate-btn, .pay-btn {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.cta-btn::before,
.calculate-btn::before,
.pay-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.cta-btn:hover::before,
.calculate-btn:hover::before,
.pay-btn:hover::before {
    left: 100%;
}

/* Smooth section transitions */
.auth-section,
.calculator-section,
.payment-section {
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.auth-section.appear,
.calculator-section.appear,
.payment-section.appear {
    animation: sectionSlideIn 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes sectionSlideIn {
    0% {
        opacity: 0;
        transform: translateY(30px) scale(0.98);
        filter: blur(2px);
    }
    100% {
        opacity: 1;
        transform: translateY(0) scale(1);
        filter: blur(0px);
    }
}

/* Mobile optimization for crypto payments */
@media (max-width: 768px) {
    .crypto-payment-container {
        max-height: 60vh;
        padding: 5px;
    }

    .crypto-payment-option {
        padding: 20px 15px;
        margin-bottom: 15px;
    }

    .crypto-payment-header {
        flex-direction: column;
        gap: 15px;
    }

    .crypto-payment-header h4 {
        font-size: 1.1rem;
    }

    .qr-code {
        width: 100px;
        height: 100px;
    }

    .wallet-address-container {
        flex-direction: column;
        gap: 10px;
        padding: 12px;
    }

    .wallet-address-container::before {
        display: none;
    }

    .wallet-address {
        padding: 0;
        text-align: center;
        font-size: 0.8rem;
    }

    .copy-btn {
        width: 100%;
        justify-content: center;
        padding: 12px;
    }

    .payment-instructions {
        padding: 15px;
        margin-top: 15px;
    }

    .payment-instructions p {
        font-size: 0.9rem;
    }
}

/* Responsive Design */

/* Tablet Styles */
@media (max-width: 1024px) {
    .container {
        padding: 0 15px;
    }

    .welcome-content h1 {
        font-size: 2.5rem;
    }

    .calculator-section h2,
    .payment-section h2 {
        font-size: 2rem;
    }
}

/* Advanced Mobile Header Styles */
@media (max-width: 768px) {
    .ato-header {
        position: fixed !important;
        top: 0 !important;
        left: 0 !important;
        right: 0 !important;
        width: 100% !important;
        z-index: 10000 !important;
        padding: 0;
        box-shadow: 0 2px 20px rgba(0, 0, 0, 0.15);
        background: linear-gradient(135deg, #0066cc 0%, #003366 100%) !important;
        -webkit-position: fixed !important;
        -webkit-transform: translateZ(0) !important;
        transform: translateZ(0) !important;
        will-change: transform !important;
    }

    /* Force sticky behavior on mobile */
    body {
        padding-top: 60px !important; /* Account for fixed header */
        overflow-x: hidden;
    }

    .ato-header::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: linear-gradient(135deg, rgba(0, 102, 204, 0.95), rgba(0, 51, 102, 0.95));
        backdrop-filter: blur(10px);
        z-index: -1;
    }

    .header-container {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 12px 16px;
        position: relative;
        min-height: 60px;
    }

    .ato-logo {
        display: flex;
        align-items: center;
        gap: 8px;
        flex: 1;
        min-width: 0;
    }

    .ato-logo-link {
        display: flex;
        align-items: center;
        gap: 8px;
        text-decoration: none;
        color: inherit;
        min-width: 0;
    }

    .ato-logo-img {
        height: 32px;
        width: auto;
        flex-shrink: 0;
        filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
        transition: transform 0.3s ease;
    }

    .ato-logo-img:hover {
        transform: scale(1.05);
    }

    .ato-title-container {
        display: flex;
        flex-direction: column;
        align-items: flex-start;
        line-height: 1.1;
        min-width: 0;
        flex: 1;
    }

    .ato-government,
    .ato-title {
        font-size: 0.6rem !important;
        font-weight: 600 !important;
        white-space: nowrap;
        line-height: 1.1;
    }

    .ato-government {
        border-bottom: none !important;
        padding-bottom: 0 !important;
        margin-bottom: 0 !important;
    }

    /* Mobile Navigation - Redesigned Hamburger Menu */
    .mobile-nav-toggle {
        display: flex !important;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        width: 50px;
        height: 50px;
        background: linear-gradient(135deg, rgba(255, 255, 255, 0.15), rgba(255, 255, 255, 0.05));
        border: 2px solid rgba(255, 255, 255, 0.2);
        color: #ffffff;
        font-size: 1.4rem;
        cursor: pointer;
        padding: 10px;
        border-radius: 12px;
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        position: relative;
        z-index: 10001;
        flex-shrink: 0;
        -webkit-tap-highlight-color: rgba(255, 255, 255, 0.3);
        touch-action: manipulation;
        box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
        backdrop-filter: blur(10px);
    }

    .mobile-nav-toggle::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: linear-gradient(135deg, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0.05));
        border-radius: 10px;
        opacity: 0;
        transition: opacity 0.3s ease;
    }

    .mobile-nav-toggle:hover {
        background: linear-gradient(135deg, rgba(255, 255, 255, 0.25), rgba(255, 255, 255, 0.15));
        border-color: rgba(255, 255, 255, 0.4);
        transform: scale(1.08) translateY(-2px);
        box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
    }

    .mobile-nav-toggle:hover::before {
        opacity: 1;
    }

    .mobile-nav-toggle:active {
        transform: scale(0.95) translateY(0);
        box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    }

    .mobile-nav-toggle span {
        display: block;
        width: 24px;
        height: 2.5px;
        background: linear-gradient(90deg, #ffffff, #e3f2fd);
        margin: 3.5px 0;
        border-radius: 2px;
        transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        position: relative;
        transform-origin: center;
        box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
    }

    .mobile-nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(7px, 7px);
        background: linear-gradient(90deg, #4caf50, #66bb6a);
    }

    .mobile-nav-toggle.active span:nth-child(2) {
        opacity: 0;
        transform: scaleX(0) translateX(-10px);
    }

    .mobile-nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -7px);
        background: linear-gradient(90deg, #4caf50, #66bb6a);
    }

    /* Pulse animation for active state */
    .mobile-nav-toggle.active {
        animation: menuActivePulse 0.6s ease-out;
        background: linear-gradient(135deg, rgba(76, 175, 80, 0.2), rgba(102, 187, 106, 0.1));
        border-color: rgba(76, 175, 80, 0.4);
        box-shadow: 0 4px 20px rgba(76, 175, 80, 0.3);
    }

    @keyframes menuActivePulse {
        0% {
            transform: scale(1);
        }
        50% {
            transform: scale(1.1);
        }
        100% {
            transform: scale(1);
        }
    }

    .main-nav {
        position: fixed !important;
        top: 60px !important;
        left: 0 !important;
        right: 0 !important;
        bottom: 0 !important;
        width: 100% !important;
        height: calc(100vh - 60px) !important;
        background: linear-gradient(135deg, rgba(0, 51, 102, 0.98), rgba(0, 102, 204, 0.98));
        backdrop-filter: blur(20px);
        border-top: 1px solid rgba(255, 255, 255, 0.1);
        display: none !important;
        z-index: 999999 !important;
        box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
        align-items: center;
        justify-content: center;
        padding: 20px;
        box-sizing: border-box;
    }

    .main-nav.active {
        display: flex !important;
    }

    /* Force menu to appear above everything when active */
    .main-nav.active ~ * {
        pointer-events: none !important;
    }

    /* Ensure body doesn't interfere */
    body:has(.main-nav.active) {
        overflow: hidden !important;
        position: fixed !important;
        width: 100% !important;
        height: 100% !important;
    }

    /* Additional overlay to block interactions */
    .main-nav.active::after {
        content: '';
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: -1;
        pointer-events: auto;
    }

    .main-nav ul {
        display: flex;
        flex-direction: column;
        gap: 0;
        margin: 0;
        padding: 0;
        list-style: none;
        width: 100%;
        max-width: 300px;
    }

    .main-nav li {
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        width: 100%;
    }

    .main-nav li:last-child {
        border-bottom: none;
    }

    .main-nav a {
        display: block;
        padding: 18px 24px;
        color: #ffffff;
        text-decoration: none;
        font-weight: 600;
        font-size: 1.1rem;
        transition: all 0.3s ease;
        position: relative;
        overflow: hidden;
        width: 100%;
        box-sizing: border-box;
        -webkit-tap-highlight-color: rgba(255, 255, 255, 0.1);
        touch-action: manipulation;
    }

    .main-nav a::before {
        content: '';
        position: absolute;
        top: 0;
        left: -100%;
        width: 100%;
        height: 100%;
        background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.15), transparent);
        transition: left 0.5s ease;
    }

    .main-nav a:hover::before {
        left: 100%;
    }

    .main-nav a:hover,
    .main-nav a:active {
        background: rgba(255, 255, 255, 0.1);
        color: #e3f2fd;
        transform: translateX(8px);
        box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    }

    /* Mobile Header Enhancements */
    .ato-header::after {
        content: '';
        position: absolute;
        bottom: 0;
        left: 0;
        right: 0;
        height: 2px;
        background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    }

    /* Prevent horizontal scroll */
    .header-container {
        min-width: 0;
        overflow: hidden;
        box-sizing: border-box;
    }

    /* Ensure content doesn't get hidden behind fixed header */
    .welcome-section,
    .tax-hero,
    .payment-hero,
    .content-section,
    .calculator-section,
    .process-section,
    .cta-section,
    .security-section {
        padding-top: 80px !important;
    }

    /* Adjust modal positioning for mobile */
    .modal {
        top: 60px !important;
        margin-top: 0 !important;
    }
}

/* Mobile Styles */
@media (max-width: 768px) {
    .welcome-section {
        padding: 40px 0;
    }

    .welcome-content h1 {
        font-size: 2rem;
        margin-bottom: 15px;
    }

    .welcome-content p {
        font-size: 1.1rem;
        margin-bottom: 20px;
    }

    .cta-btn {
        padding: 15px 30px;
        font-size: 1.1rem;
    }

    .calculator-section,
    .payment-section {
        padding: 40px 0;
    }

    .calculator-section h2,
    .payment-section h2 {
        font-size: 1.8rem;
        margin-bottom: 30px;
    }

    .calculator-form,
    .payment-form {
        padding: 25px 20px;
        margin: 0 10px;
    }

    .results-container {
        padding: 25px 20px;
        margin: 20px 10px 0;
    }

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

    .form-group label {
        font-size: 1rem;
        margin-bottom: 6px;
    }

    .form-group input,
    .form-group select {
        padding: 12px;
        font-size: 1rem;
    }

    .calculate-btn,
    .pay-btn {
        padding: 15px 30px;
        font-size: 1.1rem;
    }

    .result-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 5px;
        padding: 12px 0;
    }

    .result-label {
        font-weight: 500;
        color: var(--text-secondary);
    }

    .footer-container {
        grid-template-columns: 1fr;
        gap: 30px;
        padding: 0 15px;
    }

    .footer-section h4 {
        font-size: 1.1rem;
    }

    .modal-content {
        width: 95%;
        margin: 10% auto;
        max-width: none;
    }

    .modal-header,
    .modal-body,
    .modal-footer {
        padding: 20px 15px;
    }

    .modal-header h2 {
        font-size: 1.3rem;
    }

    .modal-btn {
        width: 100%;
        margin: 5px 0;
        padding: 14px;
    }
}

/* Page Transition Effects */
.page-transition {
    animation: pageSlideIn 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes pageSlideIn {
    0% {
        opacity: 0;
        transform: translateY(-30px);
        filter: blur(5px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
        filter: blur(0px);
    }
}

/* Apply transition to main content areas */
.welcome-section,
.tax-hero,
.payment-hero,
.content-section,
.calculator-section,
.process-section,
.cta-section,
.security-section {
    animation: pageSlideIn 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

/* Content Pages Styles */
.content-section {
    padding: 80px 0;
    background: var(--light-bg);
    min-height: 60vh;
}

.content-section h1 {
    text-align: center;
    color: var(--primary-blue);
    margin-bottom: 40px;
    font-size: 2.5rem;
    font-weight: 700;
}

.content-wrapper {
    max-width: 900px;
    margin: 0 auto;
    background: var(--card-bg);
    padding: 50px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-medium);
    border: 1px solid var(--medium-gray-bg);
}

.content-intro {
    margin-bottom: 40px;
    padding-bottom: 20px;
    border-bottom: 2px solid var(--medium-gray-bg);
}

.content-intro p {
    font-size: 1.1rem;
    line-height: 1.6;
    color: var(--text-secondary);
}

.content-section h2 {
    color: var(--primary-blue);
    margin: 40px 0 20px 0;
    font-size: 1.8rem;
    font-weight: 600;
}

.content-section h3 {
    color: var(--secondary-blue);
    margin: 30px 0 15px 0;
    font-size: 1.4rem;
    font-weight: 600;
}

.content-section p {
    margin-bottom: 15px;
    line-height: 1.7;
    color: var(--text-primary);
}

.content-section ul {
    margin: 15px 0 20px 20px;
    padding: 0;
}

.content-section li {
    margin-bottom: 8px;
    line-height: 1.6;
    color: var(--text-primary);
}

.content-section a {
    color: var(--primary-blue);
    text-decoration: none;
    transition: var(--transition);
}

.content-section a:hover {
    color: var(--secondary-blue);
    text-decoration: underline;
}

/* Small Mobile Styles */
@media (max-width: 480px) {
    .header-container {
        padding: 10px;
    }

    .welcome-section {
        padding: 30px 0;
    }

    .welcome-content h1 {
        font-size: 1.8rem;
    }

    .welcome-content p {
        font-size: 1rem;
    }

    .cta-btn {
        padding: 12px 25px;
        font-size: 1rem;
    }

    .calculator-section h2,
    .payment-section h2 {
        font-size: 1.5rem;
    }

    .calculator-form,
    .payment-form,
    .results-container {
        padding: 20px 15px;
        margin: 0 5px;
    }

    .form-group input,
    .form-group select {
        padding: 10px;
    }

    .calculate-btn,
    .pay-btn {
        padding: 12px 25px;
        font-size: 1rem;
    }

    .footer-container {
        padding: 0 10px;
    }

    .content-section {
        padding: 40px 0;
    }

    .content-section h1 {
        font-size: 2rem;
        margin-bottom: 30px;
    }

    .content-wrapper {
        padding: 30px 20px;
        margin: 0 10px;
    }

    .content-section h2 {
        font-size: 1.5rem;
        margin: 30px 0 15px 0;
    }

    .content-section h3 {
        font-size: 1.2rem;
        margin: 25px 0 12px 0;
    }

    .modal-content {
        width: 98%;
        margin: 5% auto;
    }

    .modal-header,
    .modal-body,
    .modal-footer {
        padding: 15px 10px;
    }
}