:root {
    --primary: #6c5ce7;
    --primary-light: #a29bfe;
    --secondary: #00cec9;
    --dark: #2d3436;
    --light: #f5f6fa;
    --white: #ffffff;
    --gray: #dfe6e9;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    --radius: 16px;
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Poppins', sans-serif;
    background-color: #f9f9ff;
    color: var(--dark);
    line-height: 1.6;
    padding: 20px;
    background-image: radial-gradient(circle at 10% 20%, rgba(108, 92, 231, 0.05) 0%, rgba(108, 92, 231, 0.05) 90%);
}

.container {
    max-width: 600px;
    margin: 0 auto;
}

.header {
    text-align: center;
    margin-bottom: 40px;
    animation: fadeIn 0.8s ease;
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 10px;
    background: linear-gradient(45deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: #666;
    font-size: 1.1rem;
    font-weight: 300;
}

.calculator {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.input-card {
    background: var(--white);
    padding: 30px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.input-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.12);
}

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

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--dark);
}

.input-group input[type="date"] {
    width: 100%;
    padding: 15px;
    border: 2px solid var(--gray);
    border-radius: 10px;
    font-size: 1rem;
    font-family: 'Poppins', sans-serif;
    transition: var(--transition);
}

.input-group input[type="date"]:focus {
    border-color: var(--primary-light);
    outline: none;
}

.primary-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    padding: 16px;
    background: linear-gradient(45deg, var(--primary), var(--secondary));
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(108, 92, 231, 0.3);
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(108, 92, 231, 0.4);
}

.primary-btn svg {
    transition: var(--transition);
}

.primary-btn:hover svg {
    transform: translateX(3px);
}

.result-card {
    background: var(--white);
    padding: 30px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    animation: fadeIn 0.5s ease;
    display: none;
}

.result-card.visible {
    display: block;
}

.result-header {
    text-align: center;
    margin-bottom: 30px;
}

.result-header h2 {
    font-size: 1.8rem;
    color: var(--primary);
    margin-bottom: 10px;
}

.result-header p {
    color: #666;
}

.date-range {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    margin-bottom: 30px;
}

.date-box {
    text-align: center;
    padding: 20px;
    background: var(--light);
    border-radius: 12px;
    min-width: 120px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
}

.date-box:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

.month {
    font-size: 1.2rem;
    font-weight: 600;
    text-transform: uppercase;
    margin-bottom: 5px;
    color: var(--primary);
}

.day {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 5px;
    color: var(--dark);
}

.year {
    font-size: 1.1rem;
    color: #666;
}

.to {
    font-size: 1.2rem;
    color: #666;
    font-weight: 500;
}

.holiday-section {
    display: flex;
    align-items: center;
    gap: 20px;
    background: rgba(108, 92, 231, 0.05);
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 20px;
    border-left: 4px solid var(--primary);
}

.holiday-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.holiday-content h3 {
    font-size: 1.2rem;
    color: var(--primary);
    margin-bottom: 5px;
}

.info-note {
    font-size: 0.9rem;
    color: #666;
    text-align: center;
    font-style: italic;
}

.footer {
    text-align: center;
    margin-top: 40px;
    color: #666;
    font-size: 0.9rem;
}

.heart {
    color: #ff7675;
}

.hidden {
    display: none;
}

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

/* Responsive Design */
@media (max-width: 600px) {
    .header h1 {
        font-size: 2rem;
    }
    
    .date-range {
        flex-direction: column;
        gap: 10px;
    }
    
    .to {
        margin: 10px 0;
    }
    
    .holiday-section {
        flex-direction: column;
        text-align: center;
    }
}