:root {
    --bg-color: #1a1a1a;
    --text-color: #e0e0e0;
    --accent-color: #007bff;
    --card-bg: #2a2a2a;
    --border-radius: 8px;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.container {
    width: 90%;
    max-width: 800px;
    text-align: center;
    padding: 20px;
}

header h1 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

header p {
    font-size: 0.9rem;
    opacity: 0.8;
    margin-bottom: 2rem;
}

.hidden {
    display: none !important;
}

.secondary-btn {
    background-color: var(--card-bg);
    color: var(--text-color);
    padding: 10px 20px;
    border: 1px solid #555;
    border-radius: var(--border-radius);
    cursor: pointer;
    margin-left: 10px;
}

.settings-panel {
    background-color: var(--card-bg);
    padding: 15px;
    border-radius: var(--border-radius);
    margin-bottom: 20px;
    text-align: left;
    font-size: 0.9rem;
}

.adjustment-preview-container {
    margin-bottom: 20px;
    text-align: center;
}

.adjustment-wrapper {
    position: relative;
    display: inline-block;
    max-width: 100%;
    overflow: hidden;
    background: #000;
    line-height: 0;
    cursor: grab;
    user-select: none;
    touch-action: none; /* スマホでのドラッグを妨げないように */
}

.adjustment-wrapper:active {
    cursor: grabbing;
}

#adjustmentCanvas {
    max-width: 100%;
    height: auto;
    pointer-events: none; /* イベントはwrapperで拾う */
}

.crop-overlay {
    position: absolute;
    pointer-events: none;
    border: 2px solid #ff4444;
    background-color: rgba(255, 68, 68, 0.2);
    box-sizing: border-box;
}

.crop-frame {
    position: absolute;
    border: 2px solid #00ff00;
    box-sizing: border-box;
    pointer-events: none;
}

.setting-item {
    margin-bottom: 10px;
}

.setting-item label {
    display: block;
    margin-bottom: 5px;
}

.upload-section {
    margin-bottom: 2rem;
}

.custom-file-upload {
    background-color: var(--accent-color);
    color: white;
    padding: 12px 24px;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-weight: bold;
    display: inline-block;
    transition: background-color 0.3s ease;
}

.custom-file-upload:hover {
    background-color: #0056b3;
}

#imageInput {
    display: none;
}

.preview-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
}

.preview-item {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    overflow: hidden;
    cursor: pointer;
    transition: transform 0.2s ease;
}

.preview-item:hover {
    transform: scale(1.05);
}

.preview-item img {
    display: block;
    max-width: 150px;
    height: auto;
}

footer {
    margin-top: 2rem;
    font-size: 0.8rem;
    opacity: 0.6;
}