:root {
    --background-color: #f0f2f5;
    --text-color: #858585;
    --panel-bg: #ffffff;
    --accent-color: #007bff;
    --border-color: #e0e0e0;
}

body {
    font-family: 'Noto Sans Mono', monospace;
    margin: 0;
    background-color: var(--background-color);
    color: var(--text-color);
}

header {
    position: fixed;
    top: 1rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
    /* ↓↓↓ 以下を追加 ↓↓↓ */
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem; /* この値で空白の大きさを調整できます */
}

header h1 {
    margin: 0;
    font-size: 0.9rem;
    font-weight: 400;
    color: var(--text-color);
}

header .copyright {
    margin: 0;
    font-size: 0.65rem; /* タイトルより少し小さく */
    font-weight: 400;
    color: var(--text-color);
    opacity: 0.7; /* 少し薄くして控えめに */
    text-align: center;
}

main {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding-top: 2.6rem;
    padding-right: 1rem;
    padding-bottom: 5.4rem;
    padding-left: 1rem;

    box-sizing: border-box;
}

#drop-zone {
    width: 100%;
    max-width: 450px;
    min-height: 300px;
    border: 2px dashed var(--border-color);
    border-radius: 16px;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: background-color 0.2s, border-color 0.2s;
}

#drop-zone:hover, #drop-zone.drag-over {
    background-color: #e9ebee;
    border-color: var(--accent-color);
}

.drop-zone-prompt {
    text-align: center;
    color: var(--text-color);
}
.drop-zone-prompt svg {
    color: var(--border-color);
    width: 48px;
    height: 48px;
    transition: color 0.2s;
}
#drop-zone:hover .drop-zone-prompt svg, #drop-zone.drag-over .drop-zone-prompt svg {
    color: var(--accent-color);
}
.drop-zone-prompt p {
    margin: 0;
    line-height: 1.5;
}
.prompt-line-1 { font-size: 0.9rem; }
.prompt-line-2 { font-size: 0.8rem; margin: 0.25rem 0; }
.prompt-line-3 { font-size: 0.9rem; }


#preview-container {
    /* ★★★ 変更点: デスクトップでの最大幅を制限 ★★★ */
    max-width: 450px; /* ドロップゾーンと同じ幅に設定 */
    max-height: 80vh;
}
#preview-container img {
    width: 100%; /* コンテナに合わせて画像の幅を調整 */
    height: auto;
    object-fit: contain;
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

#control-panel {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--panel-bg);
    padding: 1rem 1.5rem;
    border-radius: 999px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    display: flex;
    align-items: center;
    /* ★★★ 変更点: レイアウト調整 ★★★ */
    justify-content: space-between;
    width: auto;
    min-width: 300px; /* パネルの最小幅を確保 */
    box-sizing: border-box;
    z-index: 100;
}
/* ★★★ 追加: 中央のコントロールをまとめるラッパー ★★★ */
.main-controls {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.control-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}
.control-group svg {
    color: var(--text-color);
}

#resolution-select {
    font-family: 'Noto Sans Mono', monospace;
    border: none;
    background: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    cursor: pointer;
    font-size: 0.9rem;
}

/* ★★★ 変更点: リセットボタンとダウンロードボタン共通のスタイル ★★★ */
#reset-button, #download-button {
    color: var(--text-color);
    cursor: pointer;
    display: flex;
    align-items: center;
    transition: opacity 0.2s, color 0.2s;
    opacity: 1;
    pointer-events: auto;
}
#reset-button:hover, #download-button:hover {
    color: var(--accent-color);
}
#reset-button.hidden, #download-button.hidden {
    opacity: 0.3;
    pointer-events: none;
    cursor: default;
}

.switch { position: relative; display: inline-block; width: 40px; height: 24px; }
.switch input { opacity: 0; width: 0; height: 0; }
.slider { position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0; background-color: #ccc; transition: .4s; border-radius: 34px; }
.slider:before { position: absolute; content: ""; height: 16px; width: 16px; left: 4px; bottom: 4px; background-color: white; transition: .4s; border-radius: 50%; }
input:checked + .slider { background-color: var(--accent-color); }
input:checked + .slider:before { transform: translateX(16px); }

#loading {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.7);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 200;
}
.spinner {
    border: 4px solid rgba(0, 0, 0, 0.1);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border-left-color: var(--accent-color);
    animation: spin 1s ease infinite;
}
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }

.hidden {
    display: none !important;
}

/* ★★★ 変更点: hiddenクラスの挙動上書きをリセットボタンにも適用 ★★★ */
#control-panel #reset-button.hidden,
#control-panel #download-button.hidden {
    display: flex !important;
    visibility: visible;
    opacity: 0.3;
    pointer-events: none;
    cursor: default;
}

#control-panel {
        justify-content: space-around;
        gap: 1rem;
    }
    #drop-zone { min-height: 250px; }
    .drop-zone-prompt p { font-size: 0.8rem; }