/**
 * Background Remover Pro - style.css
 * モダン・シンプル・クリーンなデザイン
 */

:root {
    --primary-color: #46757E;
    --primary-hover: #5a8d99;
    --accent-color: #93d9d7;
    --bg-light: #f8fafb;
    --text-main: #333;
    --text-muted: #666;
    --border-color: #e1e8ed;
    --white: #ffffff;
    --shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    --transition: all 0.3s ease;
}

/* コンテナ全体 */
.bg-remover-container {
    max-width: 650px;
    margin: 40px auto;
    padding: 30px;
    background-color: var(--white);
    border-radius: 16px;
    box-shadow: var(--shadow);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--text-main);
    line-height: 1.6;
}

.bg-remover-container h1 {
    font-size: 1.75rem;
    font-weight: 700;
    text-align: center;
    color: var(--primary-color);
    margin-bottom: 25px;
    letter-spacing: -0.5px;
}

/* ドラッグ＆ドロップエリア */
.drop-area {
    position: relative;
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    padding: 50px 20px;
    text-align: center;
    background-color: var(--bg-light);
    transition: var(--transition);
    cursor: pointer;
    margin-bottom: 25px;
}

.drop-area:hover, 
.drop-area.highlight {
    border-color: var(--primary-color);
    background-color: rgba(70, 117, 126, 0.05);
}

.drop-area p {
    margin: 10px 0;
    font-weight: 500;
}

.drop-area p:first-child {
    font-size: 1.1rem;
    color: var(--primary-color);
}

.btn-select {
    display: inline-block;
    padding: 8px 24px;
    background-color: var(--white);
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
    border-radius: 25px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-select:hover {
    background-color: var(--primary-color);
    color: var(--white);
}

/* 選択画像のプレビューエリア */
.preview-container {
    margin-bottom: 25px;
    text-align: center;
    padding: 20px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    background-color: var(--white);
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.02);
}

.preview-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 15px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

#image-preview {
    max-width: 100%;
    max-height: 350px;
    border-radius: 8px;
    object-fit: contain;
    display: block;
    margin: 0 auto;
    border: 1px solid #f0f0f0;
}

/* フォーム設定 */
.bg-remover-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.form-control {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    background-color: var(--white);
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(70, 117, 126, 0.1);
}

/* Alpha Matting設定ボックス */
#alpha-matting-settings {
    background: var(--bg-light);
    padding: 20px;
    border-radius: 10px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

#alpha-matting-settings .form-group:last-child {
    grid-column: span 2;
}

/* 実行ボタン */
.btn-submit {
    width: 100%;
    padding: 16px;
    background-color: var(--primary-color);
    color: var(--white);
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 10px rgba(70, 117, 126, 0.2);
}

.btn-submit:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 6px 15px rgba(70, 117, 126, 0.3);
}

/* ログ・進捗表示 */
.status-log {
    margin: 20px 0 10px;
    text-align: center;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--primary-color);
    min-height: 1.5em;
}

#bg-remover-progress-container {
    width: 100%;
    height: 10px;
    background-color: var(--bg-light);
    border-radius: 5px;
    overflow: hidden;
    margin-bottom: 30px;
}

.progress-bar {
    height: 100%;
    background-color: var(--accent-color);
    width: 0%;
    transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 処理結果エリア */
.bg-remover-result {
    margin-top: 30px;
    padding-top: 30px;
    border-top: 2px solid var(--bg-light);
    text-align: center;
}

.bg-remover-result h3 {
    margin-bottom: 20px;
    font-size: 1.25rem;
    color: var(--text-main);
}

/* 透明背景を示す市松模様のプレビュー */
.bg-remover-result img {
    max-width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: var(--shadow);
    margin-bottom: 25px;
    /* 透過確認用の市松模様背景 */
    background-image: 
        linear-gradient(45deg, #e0e0e0 25%, transparent 25%), 
        linear-gradient(-45deg, #e0e0e0 25%, transparent 25%), 
        linear-gradient(45deg, transparent 75%, #e0e0e0 75%), 
        linear-gradient(-45deg, transparent 75%, #e0e0e0 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
}

.btn-download {
    display: inline-block;
    padding: 14px 40px;
    background-color: #2c3e50;
    color: var(--white);
    text-decoration: none;
    border-radius: 30px;
    font-weight: 700;
    transition: var(--transition);
}

.btn-download:hover {
    background-color: #1a252f;
    transform: scale(1.05);
}

/* レスポンス対応 */
@media (max-width: 600px) {
    .bg-remover-container {
        margin: 20px 10px;
        padding: 20px;
    }
    #alpha-matting-settings {
        grid-template-columns: 1fr;
    }
    #alpha-matting-settings .form-group:last-child {
        grid-column: span 1;
    }
}