:root {
    --border-color: #ddd;
    --primary-bg: #f9f9f9;
    --text-color: #333;
    --sun-color: #e60012;
    --sat-color: #0070c0;
    --button-bg: #4CAF50;
    --button-hover-bg: #45a049;
    --danger-button-bg: #f44336;
    --danger-button-hover-bg: #da190b;
}

body {
    font-family: 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
    background-color: var(--primary-bg);
    color: var(--text-color);
    margin: 0;
    padding: 1rem;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

#calendar-area {
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 1.5rem;
}

.calendar-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.calendar-nav button {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    cursor: pointer;
    font-size: 1.5rem;
    transition: background-color 0.2s;
}

.calendar-nav button:hover {
    background-color: #f0f0f0;
}

#monthYear {
    font-size: 1.8rem;
    font-weight: bold;
}

#calendar {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 1px;
    background-color: var(--border-color);
    border: 1px solid var(--border-color);
}

.calendar-header,
.calendar-day {
    background-color: #fff;
    padding: 0.5rem;
    text-align: left;
    min-height: 100px;
}

.calendar-header {
    min-height: auto;
    text-align: center;
    font-weight: bold;
    padding: 0.8rem 0.5rem;
}

.calendar-day span {
    display: block;
    margin-bottom: 0.3rem;
    font-size: 1.3em;
}

.events {
    font-size: 1.5em;
    text-align: center;
    line-height: 1.3;
}

.sun { color: var(--sun-color); }
.sat { color: var(--sat-color); }

.controls-wrapper {
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 1.5rem;
}

.controls-wrapper h3 {
    margin-top: 0;
    border-bottom: 2px solid var(--primary-bg);
    padding-bottom: 0.5rem;
}

.setting-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
    padding: 10px;
    border-bottom: 1px solid #eee;
}

.setting-row:last-child {
    border-bottom: none;
}

.setting-row input[type="text"],
.setting-row select {
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
}

.setting-row input[type="text"] {
    width: 120px;
}

.setting-row input[type="text"][placeholder="表示文字"] {
    width: 80px;
}

.setting-row input[type="color"] {
    width: 40px;
    height: 40px;
    border: none;
    padding: 0;
    cursor: pointer;
    background-color: transparent;
}

.preset-colors {
    display: flex;
    gap: 5px;
}
.color-box {
    width: 25px;
    height: 25px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
}

.setting-row label {
    margin-left: 10px;
}

.setting-row input[type="range"] {
    width: 150px;
    cursor: pointer;
}

.bottom-controls {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.bottom-controls button,
.setting-row .delete-btn {
    padding: 10px 20px;
    font-size: 1rem;
    color: white;
    background-color: var(--button-bg);
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.2s;
}

.bottom-controls button:hover,
.setting-row .delete-btn:hover {
    background-color: var(--button-hover-bg);
}

#clearAll, .setting-row .delete-btn {
    background-color: var(--danger-button-bg);
}
#clearAll:hover, .setting-row .delete-btn:hover {
    background-color: var(--danger-button-hover-bg);
}

.footer {
    text-align: center;
    margin-top: 2rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.footer a {
    color: #007bff;
    text-decoration: none;
}
.footer a:hover {
    text-decoration: underline;
}

@media (max-width: 768px) {
    body {
        padding: 0.5rem;
    }
    .container {
        padding: 0.5rem;
    }
    #monthYear {
        font-size: 1.4rem;
    }
    .calendar-header, .calendar-day {
        min-height: 80px;
        padding: 0.3rem;
        font-size: 0.8rem;
    }
    .events {
        font-size: 0.7em;
    }
    .setting-row {
        flex-direction: column;
        align-items: stretch;
    }
    .setting-row input, .setting-row select {
        width: 100% !important;
    }
}