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

body {
    font-family: 'Cairo', sans-serif;
    background: linear-gradient(135deg, #0f0f23 0%, #1a1a2e 50%, #16213e 100%);
    color: #ffffff;
    min-height: 100vh;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Header Styles */
.header {
    text-align: center;
    margin-bottom: 40px;
    padding: 40px 0;
    position: relative;
}

/* Language Switcher */
.language-switcher {
    position: absolute;
    top: 20px;
    right: 20px;
    display: flex;
    gap: 10px;
    z-index: 100;
}

.lang-btn {
    padding: 8px 15px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    color: #ffffff;
    font-size: 0.9rem;
    font-family: 'Cairo', sans-serif;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 5px;
}

.lang-btn:hover {
    background: rgba(78, 205, 196, 0.2);
    border-color: #4ecdc4;
    transform: translateY(-2px);
}

.lang-btn.active {
    background: linear-gradient(45deg, #ff6b6b, #4ecdc4);
    border-color: transparent;
    box-shadow: 0 4px 15px rgba(255, 107, 107, 0.3);
}

.lang-btn i {
    font-size: 0.8rem;
}

.title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 10px;
    background: linear-gradient(45deg, #ff6b6b, #4ecdc4, #45b7d1);
    background-size: 200% 200%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradientShift 3s ease-in-out infinite;
}

.title i {
    margin-left: 15px;
    color: #ff6b6b;
}

.subtitle {
    font-size: 1.2rem;
    color: #b8b8b8;
    font-weight: 300;
}

/* Main Content */
.main-content {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

/* Calculator Card */
.calculator-card {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 40px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.calculator-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}

/* Input Section */
.input-section h2 {
    text-align: center;
    margin-bottom: 30px;
    font-size: 1.8rem;
    color: #4ecdc4;
}

.date-inputs {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.input-group {
    display: flex;
    flex-direction: column;
}

.input-group label {
    margin-bottom: 8px;
    font-weight: 600;
    color: #b8b8b8;
}

.input-group input,
.input-group select {
    padding: 15px;
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.05);
    color: #ffffff;
    font-size: 1rem;
    font-family: 'Cairo', sans-serif;
    transition: all 0.3s ease;
}

.input-group input:focus,
.input-group select:focus {
    outline: none;
    border-color: #4ecdc4;
    box-shadow: 0 0 0 3px rgba(78, 205, 196, 0.2);
    transform: translateY(-2px);
}

.input-group input::placeholder {
    color: #666;
}

.input-hint {
    color: #888;
    font-size: 0.9rem;
    margin-top: 5px;
    display: block;
}

/* Quick Dates Section */
.quick-dates {
    margin: 25px 0;
    padding: 20px;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.quick-dates h4 {
    color: #4ecdc4;
    margin-bottom: 15px;
    font-size: 1.1rem;
    text-align: center;
}

.quick-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
}

.quick-btn {
    padding: 10px 15px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    color: #ffffff;
    font-size: 0.9rem;
    font-family: 'Cairo', sans-serif;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 80px;
}

.quick-btn:hover {
    background: rgba(78, 205, 196, 0.2);
    border-color: #4ecdc4;
    transform: translateY(-2px);
}

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

.quick-btn.active {
    background: linear-gradient(45deg, #ff6b6b, #4ecdc4);
    border-color: transparent;
    box-shadow: 0 4px 15px rgba(255, 107, 107, 0.3);
}

/* Calculate Button */
.calculate-btn {
    width: 100%;
    padding: 18px;
    background: linear-gradient(45deg, #ff6b6b, #4ecdc4);
    border: none;
    border-radius: 12px;
    color: white;
    font-size: 1.2rem;
    font-weight: 600;
    font-family: 'Cairo', sans-serif;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.calculate-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(255, 107, 107, 0.4);
}

.calculate-btn:active {
    transform: translateY(-1px);
}

/* Result Section */
.result-section {
    margin-top: 30px;
    animation: slideUp 0.5s ease-out;
}

.result-card {
    background: rgba(78, 205, 196, 0.1);
    border-radius: 16px;
    padding: 30px;
    border: 1px solid rgba(78, 205, 196, 0.2);
    text-align: center;
}

.age-display {
    margin-bottom: 30px;
}

.age-number {
    font-size: 4rem;
    font-weight: 700;
    color: #4ecdc4;
    text-shadow: 0 0 20px rgba(78, 205, 196, 0.5);
    animation: pulse 2s infinite;
}

.age-label {
    font-size: 1.5rem;
    color: #b8b8b8;
    margin-top: 5px;
}

.age-details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.detail-item {
    background: rgba(255, 255, 255, 0.05);
    padding: 20px;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: transform 0.3s ease;
}

.detail-item:hover {
    transform: translateY(-5px);
}

.detail-item i {
    font-size: 1.5rem;
    color: #ff6b6b;
    margin-bottom: 10px;
    display: block;
}

.detail-item span {
    font-size: 1.3rem;
    font-weight: 600;
    color: #4ecdc4;
}

/* Fun Facts */
.fun-facts {
    background: rgba(255, 107, 107, 0.1);
    border-radius: 12px;
    padding: 20px;
    border: 1px solid rgba(255, 107, 107, 0.2);
    margin-top: 20px;
}

.fun-facts h4 {
    color: #ff6b6b;
    margin-bottom: 15px;
    font-size: 1.2rem;
}

.fun-facts p {
    color: #b8b8b8;
    margin-bottom: 20px;
    font-size: 1rem;
    line-height: 1.6;
}

.fun-facts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 15px;
    margin-top: 15px;
}

.fun-fact-item {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    padding: 15px;
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: transform 0.3s ease;
}

.fun-fact-item:hover {
    transform: translateY(-3px);
    border-color: rgba(255, 107, 107, 0.3);
}

.fun-fact-item i {
    font-size: 1.5rem;
    color: #ff6b6b;
    margin-bottom: 8px;
    display: block;
}

.fun-fact-item span {
    font-size: 1.1rem;
    font-weight: 600;
    color: #4ecdc4;
    display: block;
    margin-bottom: 5px;
}

.fun-fact-item small {
    color: #888;
    font-size: 0.9rem;
}

/* Features Section */
.features-section h3 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 30px;
    color: #4ecdc4;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
}

.feature-card {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border-radius: 16px;
    padding: 30px;
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
    cursor: pointer;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.3);
    border-color: rgba(78, 205, 196, 0.3);
}

.feature-card i {
    font-size: 3rem;
    color: #ff6b6b;
    margin-bottom: 20px;
    transition: transform 0.3s ease;
}

.feature-card:hover i {
    transform: scale(1.1);
}

.feature-card h4 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: #4ecdc4;
}

.feature-card p {
    color: #b8b8b8;
    line-height: 1.6;
}

/* Support Section */
.support-section {
    margin-top: 40px;
}

.support-card {
    background: rgba(255, 193, 7, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 40px;
    border: 1px solid rgba(255, 193, 7, 0.2);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.support-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}

.support-header {
    margin-bottom: 30px;
}

.support-header i {
    font-size: 3rem;
    color: #ffc107;
    margin-bottom: 20px;
    display: block;
}

.support-header h3 {
    font-size: 2rem;
    color: #ffc107;
    margin-bottom: 10px;
}

.support-header p {
    color: #b8b8b8;
    font-size: 1.1rem;
}

/* Bitcoin Address */
.bitcoin-address {
    margin: 30px 0;
}

.address-container {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    justify-content: center;
    align-items: center;
}

.address-container input {
    flex: 1;
    max-width: 400px;
    padding: 15px;
    border: 2px solid rgba(255, 193, 7, 0.3);
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.05);
    color: #ffffff;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    text-align: center;
    cursor: text;
}

.address-container input:focus {
    outline: none;
    border-color: #ffc107;
    box-shadow: 0 0 0 3px rgba(255, 193, 7, 0.2);
}

.copy-btn {
    padding: 15px 20px;
    background: linear-gradient(45deg, #ffc107, #ff9800);
    border: none;
    border-radius: 12px;
    color: #000;
    font-weight: 600;
    font-family: 'Cairo', sans-serif;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
}

.copy-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(255, 193, 7, 0.4);
}

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

/* QR Code */
.qr-code-container {
    margin: 20px 0;
}

#qrCode {
    width: 200px;
    height: 200px;
    margin: 0 auto 15px;
    background: #ffffff;
    border-radius: 12px;
    padding: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.qr-code-container small {
    color: #888;
    font-size: 0.9rem;
    display: block;
}

/* Support Options */
.support-options {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 30px;
}

.support-btn {
    padding: 15px 25px;
    background: linear-gradient(45deg, #ffc107, #ff9800);
    border: none;
    border-radius: 12px;
    color: #000;
    font-weight: 600;
    font-family: 'Cairo', sans-serif;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1rem;
}

.support-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(255, 193, 7, 0.4);
}

.support-btn.secondary {
    background: rgba(255, 255, 255, 0.1);
    color: #ffffff;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.support-btn.secondary:hover {
    background: rgba(255, 193, 7, 0.2);
    border-color: #ffc107;
}

/* Success Message */
.success-message {
    background: rgba(76, 175, 80, 0.1);
    border: 1px solid rgba(76, 175, 80, 0.3);
    color: #4caf50;
    padding: 15px;
    border-radius: 8px;
    margin: 10px 0;
    text-align: center;
    animation: slideIn 0.3s ease;
}

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

/* Footer */
.footer {
    text-align: center;
    margin-top: 60px;
    padding: 30px 0;
    color: #666;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* Animations */
@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .language-switcher {
        position: relative;
        top: auto;
        right: auto;
        justify-content: center;
        margin-bottom: 20px;
    }
    
    .title {
        font-size: 2rem;
    }
    
    .calculator-card {
        padding: 25px;
    }
    
    .date-inputs {
        grid-template-columns: 1fr;
    }
    
    .quick-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .quick-btn {
        width: 100%;
        max-width: 200px;
    }
    
    .age-number {
        font-size: 3rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .support-card {
        padding: 25px;
    }
    
    .address-container {
        flex-direction: column;
        align-items: stretch;
    }
    
    .address-container input {
        max-width: none;
    }
    
    .support-options {
        flex-direction: column;
        align-items: center;
    }
    
    .support-btn {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }
}

/* Loading Animation */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: #4ecdc4;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Error Styles */
.error {
    background: rgba(255, 107, 107, 0.1);
    border: 1px solid rgba(255, 107, 107, 0.3);
    color: #ff6b6b;
    padding: 15px;
    border-radius: 8px;
    margin: 10px 0;
    text-align: center;
}

/* Success Styles */
.success {
    background: rgba(78, 205, 196, 0.1);
    border: 1px solid rgba(78, 205, 196, 0.3);
    color: #4ecdc4;
    padding: 15px;
    border-radius: 8px;
    margin: 10px 0;
    text-align: center;
}