/* 基本スタイル */
:root {
    /* ライトモードの変数 */
    --bg-color: #f5f5f5;
    --text-color: #333;
    --border-color: #ccc;
    --fieldset-bg-color: #fff;
    --button-bg-color: #007bff;
    --button-text-color: #fff;
    --button-hover-bg-color: #0056b3;
    --input-bg-color: #fff;
    --input-border-color: #ccc;
    --result-bg-color: #fafafa;
    --note-text-color: #666;
    --theme-button-bg-color: #eee;
    --theme-button-hover-bg-color: #ddd;

    /* プリセットボタン色 */
    --preset-1-bg: #c8e6c9;
    --preset-1-border: #81c784;
    --preset-2-bg: #fff1c3;
    --preset-2-border: #ffd54f;
    --preset-3-bg: #ffcdd2;
    --preset-3-border: #e57373;
    --preset-4-bg: #c5cae9;
    --preset-4-border: #7986cb;
}

/* ダークモード用の変数 */
body.dark-mode {
    --bg-color: #2c2c2c;
    --text-color: #f1f1f1;
    --border-color: #555;
    --fieldset-bg-color: #3a3a3a;
    --input-bg-color: #2c2c2c;
    --input-border-color: #555;
    --result-bg-color: #252525;
    --note-text-color: #aaa;
    --theme-button-bg-color: #444;
    --theme-button-hover-bg-color: #555;

    /* プリセットボタン色 (ダーク) */
    --preset-1-bg: #2e7d32;
    --preset-1-border: #4caf50;
    --preset-2-bg: #ff8f00;
    --preset-2-border: #ffb300;
    --preset-3-bg: #d32f2f;
    --preset-3-border: #f44336;
    --preset-4-bg: #3949ab;
    --preset-4-border: #5c6bc0;
}

body {
    font-family: sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 1rem;
    line-height: 1.6;
    transition: background-color 0.2s, color 0.2s;
}

main {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

h1, h2 {
    text-align: center;
}

fieldset {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    background-color: var(--fieldset-bg-color);
    transition: background-color 0.2s, border-color 0.2s;
    margin: 0;
}

legend {
    font-weight: bold;
    padding: 0 0.5rem;
    text-align: center;
    width: 100%;
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

/* ヘッダー */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 800px;
    margin: 0 auto 1rem;
}
header h1 {
    margin: 0;
    font-size: 1.5rem;
}
#theme-toggle-button {
    background-color: var(--theme-button-bg-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    font-size: 1.2rem;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
}
#theme-toggle-button:hover {
    background-color: var(--theme-button-hover-bg-color);
}

/* 説明書き */
#description-section fieldset {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}
.description-box {
    background-color: var(--result-bg-color);
    border: 1px solid var(--border-color);
    padding: 0.75rem 1rem;
    border-radius: 4px;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}
.description-item strong {
    font-weight: bold;
    display: block;
}
/* プリセットボタン */
.preset-group-full {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.75rem;
}
.preset-btn {
    padding: 0.75rem;
    font-size: 1.1rem;
    font-weight: bold;
    border-radius: 6px;
    border: 1px solid;
    cursor: pointer;
    text-align: center;
    color: var(--text-color);
    transition: transform 0.1s;
}
.preset-btn:hover {
    transform: scale(1.02);
}
.preset-group-single {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}
.preset-btn-single {
    width: 80px;
    height: 50px;
    font-size: 1.8rem;
    border: 1px solid;
    border-radius: 6px;
    cursor: pointer;
    color: var(--text-color);
    transition: transform 0.1s;
    display: flex;
    justify-content: center;
    align-items: center;
}
.preset-btn-single:hover {
    transform: scale(1.05);
}
.preset-1 { background-color: var(--preset-1-bg); border-color: var(--preset-1-border); }
.preset-2 { background-color: var(--preset-2-bg); border-color: var(--preset-2-border); }
.preset-3 { background-color: var(--preset-3-bg); border-color: var(--preset-3-border); }
.preset-4 { background-color: var(--preset-4-bg); border-color: var(--preset-4-border); }

/* 出目直接入力 */
.manual-inputs {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(50px, 1fr));
    gap: 0.5rem;
    margin-bottom: 1rem;
}
.dice-input {
    width: 100%;
    padding: 0.5rem;
    font-size: 1.2rem;
    text-align: center;
    border: 1px solid var(--input-border-color);
    border-radius: 4px;
    background-color: var(--input-bg-color);
    color: var(--text-color);
    transition: background-color 0.2s, border-color 0.2s, color 0.2s;
    box-sizing: border-box;
}
.dice-input::-webkit-outer-spin-button, .dice-input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.dice-input[type=number] { -moz-appearance: textfield; }

/* 汎用ボタン */
button {
    border: none;
    cursor: pointer;
    transition: background-color 0.2s;
}
#show-result-button {
    width: 100%;
    font-size: 1rem;
    padding: 0.6rem 1.2rem;
    border-radius: 4px;
    background-color: var(--button-bg-color);
    color: var(--button-text-color);
}
#show-result-button:hover {
    background-color: var(--button-hover-bg-color);
}
#copy-button {
    font-size: 1rem;
    padding: 0.6rem 1.2rem;
    border-radius: 4px;
}
#copy-button.copied {
    background-color: #28a745;
}

/* 結果表示 */
.result-options {
    margin-bottom: 0.5rem;
}
.result-options label, .copy-options label {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    cursor: pointer;
}
#result-display {
    background-color: var(--result-bg-color);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 1rem;
    min-height: 100px;
    white-space: pre-wrap;
    transition: background-color 0.2s, border-color 0.2s;
}
.copy-options {
    margin-top: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}