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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

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

/* Header */
.header {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 2rem 0;
    text-align: center;
    color: white;
    margin-bottom: 2rem;
}

.header h1 {
    font-size: 3rem;
    margin-bottom: 0.5rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.tagline {
    font-size: 1.2rem;
    opacity: 0.9;
}

/* Tabs */
.tabs {
    display: flex;
    justify-content: center;
    margin-bottom: 2rem;
    gap: 1rem;
    flex-wrap: wrap;
}

.tab-btn {
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid rgba(255, 255, 255, 0.3);
    color: white;
    padding: 1rem 2rem;
    border-radius: 50px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.tab-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
}

.tab-btn.active {
    background: white;
    color: #667eea;
    box-shadow: 0 8px 32px rgba(0,0,0,0.2);
}

/* Tab Content */
.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* Generator Card */
.generator-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-radius: 20px;
    padding: 2.5rem;
    margin-bottom: 2rem;
    box-shadow: 0 20px 60px rgba(0,0,0,0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.generator-card h2 {
    color: #667eea;
    margin-bottom: 0.5rem;
    font-size: 2rem;
}

.generator-card p {
    color: #666;
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

/* Form Elements */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: #333;
}

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

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

.age-inputs {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.age-inputs input {
    flex: 1;
}

.age-inputs span {
    font-weight: 600;
    color: #666;
}

/* Buttons */
.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 1.2rem 2.5rem;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
    width: 100%;
    margin: 1rem 0;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 35px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: white;
    color: #667eea;
    border: 2px solid #667eea;
    padding: 0.8rem 1.5rem;
    border-radius: 25px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin: 0.5rem;
}

.btn-secondary:hover {
    background: #667eea;
    color: white;
    transform: translateY(-2px);
}

/* Results */
.results {
    margin-top: 2rem;
    padding: 2rem;
    background: #f8f9ff;
    border-radius: 15px;
    border: 2px solid #e1e5e9;
}

.results h3 {
    color: #667eea;
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.results-list {
    max-height: 400px;
    overflow-y: auto;
    margin-bottom: 1rem;
}

.birthday-item {
    background: white;
    padding: 1rem;
    margin-bottom: 0.5rem;
    border-radius: 10px;
    border-left: 4px solid #667eea;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.birthday-date {
    font-weight: 600;
    font-size: 1.1rem;
}

.birthday-info {
    font-size: 0.9rem;
    color: #666;
}

.result-actions {
    text-align: center;
    margin-top: 1rem;
}

/* Wish Output */
.wish-output {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    border-left: 5px solid #667eea;
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 1rem;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

/* Age Calculator Results */
.age-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.age-card {
    background: white;
    padding: 1.5rem;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.age-card h4 {
    color: #667eea;
    margin-bottom: 1rem;
    font-size: 1rem;
}

.age-number {
    font-size: 2.5rem;
    font-weight: bold;
    color: #333;
}

.age-text {
    font-size: 1.2rem;
    color: #333;
    font-weight: 600;
}

/* Statistics */
.stats-section {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-radius: 20px;
    padding: 2rem;
    margin-bottom: 2rem;
    text-align: center;
}

.stats-section h2 {
    color: #667eea;
    margin-bottom: 2rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.stat-item {
    padding: 1rem;
}

.stat-number {
    font-size: 3rem;
    font-weight: bold;
    color: #667eea;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 1rem;
    color: #666;
    font-weight: 600;
}

/* Features */
.features-section {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-radius: 20px;
    padding: 2rem;
    margin-bottom: 2rem;
}

.features-section h2 {
    text-align: center;
    color: #667eea;
    margin-bottom: 2rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    text-align: center;
    padding: 1.5rem;
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    color: #667eea;
    margin-bottom: 1rem;
}

.feature-card p {
    color: #666;
    line-height: 1.6;
}

/* Footer */
.footer {
    background: rgba(0, 0, 0, 0.8);
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-top: 2rem;
}

.footer p {
    margin-bottom: 0.5rem;
    opacity: 0.8;
}

/* Toast */
.toast {
    position: fixed;
    top: 20px;
    right: 20px;
    background: #4CAF50;
    color: white;
    padding: 1rem 2rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
    transform: translateX(400px);
    transition: transform 0.3s ease;
    z-index: 1000;
}

.toast.show {
    transform: translateX(0);
}

.toast.error {
    background: #f44336;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header h1 {
        font-size: 2rem;
    }
    
    .tagline {
        font-size: 1rem;
    }
    
    .generator-card {
        padding: 1.5rem;
    }
    
    .tabs {
        flex-direction: column;
        align-items: center;
    }
    
    .tab-btn {
        width: 100%;
        max-width: 300px;
    }
    
    .age-inputs {
        flex-direction: column;
        align-items: stretch;
    }
    
    .age-inputs span {
        text-align: center;
        padding: 0.5rem 0;
    }
    
    .age-info {
        grid-template-columns: 1fr;
    }
    
    .stats-grid,
    .features-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .generator-card {
        padding: 1rem;
    }
    
    .btn-primary {
        padding: 1rem 1.5rem;
        font-size: 1rem;
    }
    
    .result-actions {
        display: flex;
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .btn-secondary {
        margin: 0;
        width: 100%;
    }
}