@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@400;700&display=swap');

:root {
    --bg-color: #121212;
    --primary-color: #1e1e1e;
    --secondary-color: #2e2e2e;
    --text-color: #e0e0e0;
    --accent-color: #03dac6;
    --error-color: #cf6679;
}

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

body {
    font-family: 'Noto Sans JP', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.container {
    background-color: var(--primary-color);
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
    width: 100%;
    max-width: 500px;
}

h1 {
    text-align: center;
    margin-bottom: 25px;
    color: var(--accent-color);
    font-weight: 700;
}

.mode-selector {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 25px;
}

.mode-selector label {
    cursor: pointer;
    padding: 8px 15px;
    border-radius: 6px;
    transition: background-color 0.3s;
}

.mode-selector input[type="radio"] {
    display: none;
}

.mode-selector input[type="radio"]:checked + label {
    background-color: var(--accent-color);
    color: var(--bg-color);
}


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

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 0.9em;
    color: var(--text-color);
    opacity: 0.8;
}

.input-group input {
    width: 100%;
    padding: 12px;
    background-color: var(--secondary-color);
    border: 1px solid var(--secondary-color);
    border-radius: 6px;
    color: var(--text-color);
    font-size: 1em;
    transition: border-color 0.3s, box-shadow 0.3s;
}

.input-group input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(3, 218, 198, 0.2);
}

/* Style for date picker indicator */
input[type="date"]::-webkit-calendar-picker-indicator {
    filter: invert(1);
    cursor: pointer;
}


button {
    width: 100%;
    padding: 15px;
    background-color: var(--accent-color);
    border: none;
    border-radius: 6px;
    color: var(--bg-color);
    font-size: 1.1em;
    font-weight: 700;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.1s;
}

button:hover {
    background-color: #018786;
}

button:active {
    transform: scale(0.98);
}

.result-box {
    margin-top: 25px;
    padding: 20px;
    background-color: var(--secondary-color);
    border-radius: 6px;
    text-align: center;
    line-height: 1.6;
    min-height: 80px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.1em;
    color: var(--text-color);
    white-space: pre-wrap; /* Allows line breaks */
}

.result-box.error {
    color: var(--error-color);
}