/* =================================================================
   基本スタイル & ヘッダー
================================================================= */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: #f0f2f5;
    color: #333;
    margin: 0;
    padding: 0;
}
header {
    background-color: #fff;
    padding: 1rem 2rem;
    border-bottom: 1px solid #ddd;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}
h1, h2, h3 { margin-top: 0; }
/* =================================================================
   メインコンテナ・レイアウト
================================================================= */
.container {
    display: flex;
    flex-wrap: wrap;
    padding: 2rem;
    gap: 2rem;
}
/* =================================================================
   左側：コントロールパネル
================================================================= */
.controls {
    flex: 1;
    min-width: 300px;
    background-color: #fff;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    align-self: flex-start;
}
.color-picker {
    width: 100%;
    height: 150px;
    border: none;
    padding: 0;
    background-color: transparent;
    cursor: pointer;
}
.input-group { margin-top: 1.5rem; }
.input-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
}
.input-with-prefix {
    display: flex;
    align-items: center;
    border: 1px solid #ccc;
    border-radius: 4px;
}
.input-with-prefix span {
    padding: 0.5rem;
    background-color: #f7f7f7;
    border-right: 1px solid #ccc;
}
.input-with-prefix input { border: none; outline: none; width: 100%; }
.multi-input {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(60px, 1fr));
    gap: 0.5rem;
}
input[type="text"], input[type="number"] {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;
}
/* ★★★ここから追加★★★ */
.slider-group {
    margin-top: 0.75rem;
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.5rem;
}
input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 8px;
    background: #ddd;
    outline: none;
    opacity: 0.7;
    transition: opacity .2s;
    border-radius: 4px;
}
input[type="range"]:hover { opacity: 1; }
input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: #fff;
    cursor: pointer;
    border-radius: 50%;
    border: 1px solid #ccc;
    box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}
input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: #fff;
    cursor: pointer;
    border-radius: 50%;
    border: 1px solid #ccc;
    box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}
/* ★★★ここまで追加★★★ */

/* =================================================================
   右側：カラーパレット表示
================================================================= */
.palette-display { flex: 3; min-width: 400px; }
.palette-section { margin-bottom: 2rem; }
.color-card-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 1rem;
}
.color-card {
    border: 1px solid #ddd;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}
.color-swatch { height: 100px; width: 100%; }
.color-info {
    padding: 0.75rem;
    background-color: #fff;
    font-size: 0.85rem;
    color: #333;
}
.color-info.text-light { background-color: #333; color: #fff; }
.color-info.text-light .copy-btn { color: #fff; }
.color-info p {
    margin: 0.4rem 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.color-info span { font-family: 'Menlo', 'Monaco', monospace; }
.copy-btn {
    background: none; border: none; cursor: pointer;
    font-size: 1rem; opacity: 0.6; transition: opacity 0.2s; color: #333;
}
.copy-btn:hover { opacity: 1; }

/* ★★★ここから追加★★★ */
/* =================================================================
   トースト通知
================================================================= */
.toast {
    visibility: hidden; /* 最初は非表示 */
    min-width: 250px;
    background-color: #333;
    color: #fff;
    text-align: center;
    border-radius: 4px;
    padding: 16px;
    position: fixed;
    z-index: 1;
    right: 30px;
    bottom: 30px;
    font-size: 17px;
    opacity: 0;
    transition: visibility 0.5s, opacity 0.5s linear;
}
/* 表示用のクラス */
.toast.show {
    visibility: visible;
    opacity: 1;
}
/* ★★★ここまで追加★★★ */