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

:root {
    --dark-grey: #0a0a23;
    --white: #ffffff;
    --yellow: #f1be32;
    --light-yellow: #f8e169;
    --light-grey: #2a2a40;
    --medium-grey: #1b1b32;
    --blue: #3a86ff;
    --green: #4cc9f0;
    --purple: #8338ec;
    --shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
    --transition: all 0.3s ease;
}

body {
    color: var(--white);
    background-color: var(--dark-grey);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background: linear-gradient(135deg, var(--dark-grey) 0%, var(--medium-grey) 100%);
}

.container {
    width: 100%;
    max-width: 600px;
}

.card {
    background-color: var(--light-grey);
    border-radius: 16px;
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: var(--transition);
}

.card:hover {
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.4);
}

.header {
    padding: 30px 30px 10px;
    text-align: center;
    background: linear-gradient(135deg, var(--blue) 0%, var(--purple) 100%);
}

.title-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 10px;
}

.title {
    font-size: 2.5rem;
    font-weight: 700;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.icon-container {
    width: 50px;
    height: 50px;
    background-color: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-container i {
    font-size: 1.5rem;
    color: var(--white);
}

.subtitle {
    font-size: 1rem;
    opacity: 0.9;
    font-weight: 300;
}

.divider {
    height: 4px;
    background: linear-gradient(to right, var(--blue), var(--purple), var(--green));
}

.content {
    padding: 30px;
}

.dropdown-container {
    margin-bottom: 30px;
}

.dropdown-label {
    display: block;
    margin-bottom: 10px;
    font-weight: 600;
    color: var(--green);
    font-size: 1.1rem;
}

.dropdown-label i {
    margin-right: 8px;
}

.date-select {
    display: block;
    width: 100%;
    height: 50px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    background-color: var(--medium-grey);
    border: 2px solid var(--blue);
    color: var(--white);
    appearance: none;
    padding: 10px 15px;
    border-radius: 10px;
    transition: var(--transition);
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23ffffff' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 15px center;
    background-size: 16px;
}

.date-select:focus {
    outline: none;
    border-color: var(--green);
    box-shadow: 0 0 0 3px rgba(76, 201, 240, 0.3);
}

.date-display-container {
    margin-top: 20px;
}

.date-card {
    background-color: var(--medium-grey);
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    border-left: 4px solid var(--green);
}

.date-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
    color: var(--green);
    font-weight: 600;
}

.formatted-date {
    font-size: 1.8rem;
    text-align: center;
    margin: 20px 0;
    font-weight: 700;
    color: var(--yellow);
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 10px;
    background-color: rgba(10, 10, 35, 0.3);
    border-radius: 8px;
}

.date-footer {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    color: #aaa;
    justify-content: center;
}

.footer {
    padding: 15px 30px;
    text-align: center;
    background-color: var(--medium-grey);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.9rem;
    color: #aaa;
}

.highlight {
    animation: highlight 0.5s ease;
}

/* Responsive design */
@media (max-width: 768px) {
    .title {
        font-size: 2rem;
    }

    .formatted-date {
        font-size: 1.5rem;
    }

    .content {
        padding: 20px;
    }
}

@media (max-width: 480px) {
    .title {
        font-size: 1.8rem;
    }

    .title-container {
        flex-direction: column;
        gap: 10px;
    }

    .formatted-date {
        font-size: 1.3rem;
    }

    .header {
        padding: 20px 20px 10px;
    }
}