:root {
    --bg-color: #0f172a;
    --sidebar-bg: #1e293b;
    --card-bg: #334155;
    --text-color: #f1f5f9;
    --accent-blue: #38bdf8;
    --border-color: #475569;
    --sidebar-width: 280px;
}
body.light-mode {
    --bg-color: #f8fafc;
    --sidebar-bg: #ffffff;
    --card-bg: #ffffff;
    --text-color: #1e293b;
    --accent-blue: #0284c7;
    --border-color: #e2e8f0;
}
body { 
    margin: 0; display: flex; font-family: 'Pretendard', sans-serif; 
    background-color: var(--bg-color);
    background-image: url('bg.jpg');   
    background-repeat: no-repeat;
    background-position: center center;
    background-attachment: fixed;      
    background-size: cover;            
    color: var(--text-color); 
    transition: background 0.3s; overflow-x: hidden;
}

#sidebar { 
    width: var(--sidebar-width); height: 100vh; position: fixed; 
    background: var(--sidebar-bg); border-right: 1px solid var(--border-color); padding: 30px 20px; box-sizing: border-box;
    z-index: 100;
}
#sidebar h1 { color: var(--accent-blue); text-align: center; font-size: 24px; margin-bottom: 25px; }

.css-btn {
    display: block; width: 100%; padding: 12px; margin-bottom: 12px;
    border: none; border-radius: 8px; font-weight: bold; cursor: pointer;
    background: var(--accent-blue); color: #0f172a; transition: 0.2s;
}
.css-btn-gray { background: #64748b; color: white; }
.css-btn:hover { opacity: 0.9; }

.toolbar { display: flex; justify-content: flex-start; gap: 10px; margin: 10px 0 15px; padding-right: 5px; }
.toolbar .css-btn { width: auto; display: inline-block; padding: 8px 16px; margin-bottom: 0; font-size: 13px; }

.switch-wrap { display: flex; align-items: center; justify-content: space-between; margin-bottom: 25px; }
.switch { position: relative; display: inline-block; width: 46px; height: 22px; }
.switch input { opacity: 0; width: 0; height: 0; }
.slider {
    position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0;
    background-color: #475569; transition: .4s; border-radius: 22px;
}
.slider:before {
    position: absolute; content: ""; height: 16px; width: 16px; left: 3px; bottom: 3px;
    background-color: white; transition: .4s; border-radius: 50%;
}
input:checked + .slider { background-color: var(--accent-blue); }
input:checked + .slider:before { transform: translateX(24px); }

.bgm-box { background: var(--card-bg); padding: 15px; border-radius: 12px; border: 1px solid var(--border-color); margin-bottom: 20px; }
#now-title { font-weight: bold; font-size: 12px; color: var(--accent-blue); margin-bottom: 10px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.bgm-btns { display: flex; gap: 5px; }
.bgm-btns .css-btn { padding: 8px; font-size: 11px; }
.vol-box { display: flex; align-items: center; gap: 10px; font-size: 11px; margin-top: 10px; }
#next-list { font-size: 11px; color: #94a3b8; padding-left: 15px; margin-top: 10px; list-style: none; }

.auth-input {
    width: 100%; padding: 10px; border: 1px solid var(--border-color); border-radius: 8px; 
    background: var(--bg-color); color: var(--text-color); text-align: center; margin-bottom: 10px; box-sizing: border-box;
}

#main-content { 
    margin-left: var(--sidebar-width); padding: 40px; width: calc(100% - var(--sidebar-width)); 
    transition: opacity 0.4s ease, filter 0.4s ease; 
}
#main-content.is-scrolling { opacity: 0.15; filter: blur(4px); pointer-events: none; }

.photo-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 20px; }
.photo-card { position: relative; aspect-ratio: 1/1; border-radius: 12px; overflow: hidden; background: var(--card-bg); border: 1px solid var(--border-color); }
.photo-card img { width: 100%; height: 100%; object-fit: cover; cursor: pointer; }
.photo-card input { position: absolute; top: 10px; left: 10px; z-index: 5; }

.pager { display: flex; justify-content: center; gap: 5px; margin: 25px 0; }
.pager a { 
    padding: 8px 12px; background: var(--card-bg); border-radius: 6px; 
    text-decoration: none; color: var(--text-color); border: 1px solid var(--border-color); font-size: 13px;
}
.pager a.active { background: var(--accent-blue); color: #0f172a; border-color: var(--accent-blue); font-weight: bold; }

#modal {
    display: none; position: fixed; top: 0; left: 0; width: 100vw; height: 100vh; 
    background: rgba(0,0,0,0.95); z-index: 10000; justify-content: center; align-items: center;
}
#modal-img { max-width: 95%; max-height: 95%; object-fit: contain; }

.msg-modal {
    display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.6); z-index: 20000; justify-content: center; align-items: center;
    opacity: 0; transition: opacity 0.5s ease;
}
.msg-modal.show { display: flex; opacity: 1; }
.msg-content {
    background: var(--card-bg); padding: 30px 50px; border-radius: 15px; border: 1px solid var(--accent-blue);
    text-align: center; box-shadow: 0 10px 25px rgba(0,0,0,0.5); transform: translateY(20px); transition: transform 0.5s ease;
}
.msg-modal.show .msg-content { transform: translateY(0); }
#msg-text { color: var(--text-color); font-size: 20px; font-weight: bold; margin: 0; }

/* [업로드 페이지 스타일 - 화면 전체 너비] */
.upload-wrapper { display: block; width: 100%; }
.upload-title { text-align: left; margin-bottom: 20px; color: var(--accent-blue); font-size: 24px; font-weight: bold; padding-left: 5px; }

#drop-zone {
    width: 100%; height: 200px; border: 2px dashed #475569; border-radius: 12px;
    display: flex; flex-direction: column; justify-content: center; align-items: center;
    cursor: pointer; transition: 0.3s; background: rgba(30, 41, 59, 0.6); margin-bottom: 30px; box-sizing: border-box;
}
#drop-zone:hover, #drop-zone.dragover { border-color: var(--accent-blue); background: rgba(56, 189, 248, 0.1); transform: scale(1.005); }
#drop-zone .icon { font-size: 48px; margin-bottom: 15px; opacity: 0.8; }
#drop-zone .main-text { margin: 5px 0; font-size: 16px; color: #e2e8f0; font-weight: 500; }
#drop-zone .sub-text { font-size: 13px; color: #64748b; margin-top: 5px; }

#preview-area { display: grid; grid-template-columns: repeat(auto-fill, minmax(100px, 1fr)); gap: 15px; margin-bottom: 25px; }
.preview-item { position: relative; aspect-ratio: 1/1; border-radius: 8px; overflow: hidden; border: 1px solid var(--border-color); background: #000; }
.preview-item img { width: 100%; height: 100%; object-fit: cover; }
.preview-remove {
    position: absolute; top: 4px; right: 4px; background: rgba(0,0,0,0.6); color: white;
    border: none; border-radius: 50%; width: 22px; height: 22px; cursor: pointer;
    font-size: 14px; display: flex; align-items: center; justify-content: center;
}
.preview-remove:hover { background: #ef4444; }

#up-btn {
    background: #10b981; color: white; width: 100%; padding: 16px; font-size: 16px; 
    border-radius: 8px; margin-top: 10px; border: none; font-weight: bold; transition: 0.2s; cursor: pointer;
}
#up-btn:hover { background: #059669; }
#up-btn.disabled { background: #334155; color: #64748b; cursor: not-allowed; }

/* [하단 대기열 스타일] */
.staging-area { margin-top: 50px; border-top: 1px solid var(--border-color); padding-top: 30px; text-align: left; }
.staging-toolbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; }
.staging-toolbar .left-tools { display: flex; gap: 10px; width: 100%; }

/* [모달 스타일] */
.custom-modal {
    display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.7); z-index: 30000; justify-content: center; align-items: center;
}
.modal-content {
    background: var(--card-bg); padding: 30px; border-radius: 12px; width: 90%; max-width: 400px;
    text-align: center; border: 1px solid var(--accent-blue); box-shadow: 0 10px 25px rgba(0,0,0,0.5);
}
.modal-content h3 { margin-top: 0; color: var(--accent-blue); margin-bottom: 15px; }
.modal-content p { margin: 20px 0; font-size: 16px; color: var(--text-color); line-height: 1.5; }
.modal-btns { display: flex; gap: 10px; justify-content: center; margin-top: 25px; }
.modal-btns button { width: 100px; padding: 10px; }

/* [반응형 레이아웃 - 모바일 및 폴더블 기기 대응] */
@media (max-width: 1024px) {
    body {
        flex-direction: column;
    }

    #sidebar {
        width: 100%;
        height: auto;
        position: relative;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        padding: 20px;
    }

    #sidebar h1 {
        margin-bottom: 15px;
        font-size: 20px;
    }

    .switch-wrap {
        margin-bottom: 15px;
    }

    .bgm-box {
        margin-bottom: 15px;
    }

    #main-content {
        margin-left: 0;
        width: 100%;
        padding: 20px 10px;
    }

    /* 사진 그리드 조정: 한 줄에 더 많은 사진이 보이도록 minmax 크기 축소 */
    .photo-grid {
        grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
        gap: 8px;
    }

    /* 모바일에서 툴바 버튼 크기 및 간격 조정 */
    .toolbar {
        flex-wrap: wrap;
        gap: 8px;
    }

    .toolbar .css-btn {
        flex: 1;
        min-width: 120px;
    }
}

/* 아주 작은 모바일 기기 대응 */
@media (max-width: 480px) {
    .photo-grid {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
        gap: 5px;
    }
}